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  • 1. Bach, F.
    et al.
    Mero, M.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, V.
    High repetition rate, femtosecond and picosecond laser induced damage thresholds of Rb: KTiOPO4 at 1.03 μm2014In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2014Conference paper (Refereed)
    Abstract [en]

    Laser-induced damage threshold (LIDT) measurements were performed on blank, uncoated Rb:KTiOPO4 (RKTP) samples at 1.03 μm with pulse durations of 330 and 930 fs and a repetition rate of 100 kHz, including temperature dependence.

  • 2. Bach, F.
    et al.
    Mero, M.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, Valentin
    High repetition rate, femtosecond and picosecond laser induced damage thresholds of Rb: KTiOPO4 at 1.03 μm2014In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2014Conference paper (Refereed)
    Abstract [en]

    Laser-induced damage threshold (LIDT) measurements were performed on blank, uncoated Rb:KTiOPO4 (RKTP) samples at 1.03 μm with pulse durations of 330 and 930 fs and a repetition rate of 100 kHz, including temperature dependence.

  • 3. Bach, Florian
    et al.
    Mero, Mark
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, Valentin
    High repetition rate, femtosecond and picosecond laser induced damage thresholds of Rb:KTiOPO4 at 1.03 mu m2017In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 7, no 3, 744-750 p.Article in journal (Refereed)
    Abstract [en]

    A laser-induced damage study is performed on blank, uncoated Rb:KTiOPO4 (RKTP) samples at 1.03 mu m with two different pulse durations of similar to 0.3 and similar to 1.0 ps and a repetition rate of 100 kHz. The effect of the sample temperature is also considered.

  • 4. Boyko, A. A.
    et al.
    Kostyukova, N. Y.
    Badikov, V.
    Badikov, D.
    Panyutin, V.
    Shevyrdyaeva, G.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Marchev, G. M.
    Kolker, D. B.
    Petrov, V.
    Intracavity difference-frequency mixing of OPO signal and idler pulses in BaGa4Se72017In: Optics InfoBase Conference Papers, Optical Society of America, 2017, Vol. Part F41Conference paper (Refereed)
    Abstract [en]

    An overall quantum conversion efficiency of 7.8% is achieved by intracavity mixing the signal and idler of a 1.064-μm pumped Rb:PPKTP OPO in BaGa4Se7, generating >0.7 mJ pulse energy at ~7 μm and 100 Hz.

  • 5. Boyko, A. A.
    et al.
    Marchev, G. M.
    Petrov, V.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kolker, D. B.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kostyukova, N. Y.
    Intracavity-pumped, cascaded AgGaSe2 optical parametric oscillator tunable up to 18 μm2016In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2016Conference paper (Refereed)
    Abstract [en]

    We report on a AgGaSe2 optical parametric oscillator (OPO), intracavity pumped by the 1.85-μm signal pulses of a 1.064-μm pumped Rb:PPKTP OPO. It operates at 100 Hz with idler tunability from ~8 to 18 μm. 

  • 6. Boyko, A. A.
    et al.
    Marchev, G. M.
    Petrov, V.
    Pasiskevicius, Valdus
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kolker, D. B.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kostyukova, N. Y.
    Intracavity-pumped, cascaded Mid-IR optical parametric oscillator based on AgGaSe22015In: Advanced Solid State Lasers, ASSL 2015, Optical Society of America, 2015Conference paper (Refereed)
    Abstract [en]

    We report on an AgGaSe2 optical parametric oscillator (OPO), intracavity pumped by the 1.85-μm signal pulses from a 1.064-μm pumped Rb:PPKTP OPO. It operates at 100 Hz with idler tunability from 5.8 to 8.3 μm.

  • 7. Boyko, Andrey A.
    et al.
    Kostyukova, Nadezhda Y.
    Badikov, Valeriy
    Badikov, Dmitrii
    Panyutin, Vladimir
    Shevyrdyaeva, Galina
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Marchev, Georgi M.
    Kolker, Dmitry B.
    Petrov, Valentin
    Intracavity difference-frequency mixing of optical parametric oscillator signal and idler pulses in BaGa4Se72017In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 56, no 10, 2783-2786 p.Article in journal (Refereed)
    Abstract [en]

    An overall quantum conversion efficiency of 7.8% is achieved by intracavity mixing the signal and idler of a 1.064 mu m pumped Rb: PPKTP optical parametric oscillator in BaGa4Se7. In this way, a pulse energy of similar to 0.71 mJ is generated at similar to 7 mu m for a repetition rate of 100 Hz. Tuning of the mid-IR radiation is demonstrated by heating of the Rb: PPKTP crystal.

  • 8. Boyko, Andrey A.
    et al.
    Kostyukova, Nadezhda Y.
    Marchev, Georgi M.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kolker, Dmitry B.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, Valentin
    Rb:PPKTP optical parametric oscillator with intracavity difference-frequency generation in AgGaSe22016In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 41, no 12, 2791-2794 p.Article in journal (Refereed)
    Abstract [en]

    A 1.064 mu m pumped Rb:PPKTP optical parametric oscillator (OPO) generates mid-IR radiation by intracavity mixing the resonant signal and idler waves in AgGaSe2. The similar to 6 ns pulses at similar to 7 mu m have an energy of 670 mu J at 100 Hz, equivalent to an average power of 67 mW. The overall quantum conversion efficiency from 1.064 mu m amounts to 8%, and the power conversion efficiency is 1.2%.

  • 9. Boyko, Andrey A.
    et al.
    Marchev, Georgi M.
    Petrov, Valentin
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Kolker, Dmitry B.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Kostyukova, Nadezhda Y.
    Intracavity-pumped, cascaded AgGaSe2 optical parametric oscillator tunable from 5.8 to 18 mu m2015In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, no 26, 33460-33465 p.Article in journal (Refereed)
    Abstract [en]

    A AgGaSe2 nonlinear crystal placed in a coupled cavity is intracavity pumped by the similar to 1.85-mu m signal pulses of a 1.064-mu m pumped Rb: PPKTP doubly-resonant optical parametric oscillator (OPO) operating at a repetition rate of 100 Hz. Using two samples cut for type-I and II phase-matching, the overall idler tunability of the singly-resonant AgGeSe2 OPO covers an unprecedented spectral range from 5.8 to similar to 18 mu m in the mid-IR.

  • 10.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Liljestrand, Charlotte
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Sub-wavelength domain engineering in KTP isomorphs: QPM devices with counter-propagating photons2013In: 2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), New York: IEEE , 2013, 6600156- p.Conference paper (Refereed)
    Abstract [en]

    We review the recent advances in fabrication of ferroelectric-domain gratings of sub-μm periodicity in KTP and Rb-doped KTP for counter-propagating second-order nonlinear optical interactions. Their performance as QPM devices will be discussed.

  • 11.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Sub-micrometer quasi-phased-matched devices2011In: Nonlinear Optics: Materials, Fundamentals and Applications 2011, 2011Conference paper (Refereed)
    Abstract [en]

    We present the fabrication of bulk sub-micrometer ferroelectric domain gratings in KTiOPO4 for QPM counter-propagating interactions. We demonstrate that bulk Rb-doped KTiOPO4 is a promising candidate for fine-pitch periodic poling.

  • 12.
    Coetzee, Riaan S.
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Investigations of Laser Induced Damage in KTiOPO4 and Rb:KTiOPO4 at 1 mu m and 2 mu m2015In: PACIFIC RIM LASER DAMAGE 2015: OPTICAL MATERIALS FOR HIGH-POWER LASERS, 2015, Vol. 9532, 95320BConference paper (Refereed)
    Abstract [en]

    One of the most practical means of generating tunable mid-infrared output is by using cascaded parametric down-conversion from 1 mu m, where efficient and reliable high-energy nanosecond lasers are well established. The overall efficiency of the cascade relies heavily on the efficiency of the first down-conversion stage where it is beneficial to employ quasi-phase matched crystals such as periodically-poled Rb: KTiOPO4 (PPRKTP). Ultimately, the pulse energy at 2 mu m and the optimum design of the first cascade will depend on the maximum intensity which could be safely applied to these crystals and therefore these schemes mandate investigation of nanosecond laser-induced damage threshold in KTiOPO4 (KTP) and Rb:KTiOPO4 (RKTP) at 1.064 mu m and 2 mu m. In the context of high-energy systems, where the beams are at most loosely focused, the limiting energy fluence will be determined by the laser induced damage threshold (LIDT) of the bare surface. Therefore the LIDT of the bare surface is the lowest LIDT which has to be taken into account in design of robust 2 mu m parametric systems. We report surface LIDT measurements in KTP and RKTP with nanosecond pulses at 1.064 mu m and 2.1 mu m. We find that the reported LIDT for the bulk is far higher than that of the surface and therefore is unsuitable as a guide for the 2 mu m parametric system designs. LIDT values for KTP and RKTP with nanosecond pulses at 2 mu m have not been reported so far to the best of our knowledge.

  • 13.
    Coetzee, Riaan S.
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdus
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laser induced damage thresholds of KTiOPO4 and Rb:KTiOPO4 at 1 μm and 2 μm2015In: Conference on Lasers and Electro-Optics Europe - Technical Digest, IEEE conference proceedings, 2015Conference paper (Refereed)
    Abstract [en]

    Optimum design of high-energy parametric down-conversion schemes mandate investigation of nanosecond laser-induced damage threshold in KTiOPO4 and Rb:KTiOPO4 at 1.064 μm and 2 μm. A surface damage threshold of 10 J/cm2 at 2 μm was determined for both materials.

  • 14.
    Coetzee, Riaan Stuart
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Duzellier, Sophie
    Dherbecourt, Jean-Baptiste
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Raybaut, Myriam
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Gamma irradiation-induced absorption in single-domain and periodically-poled KTiOPO4 and Rb:KTiOPO42017In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 7, no 11, 4138-4146 p.Article in journal (Refereed)
    Abstract [en]

    We investigate the effect of gamma radiation on flux grown KTiOPO4 and Rb:KTiOPO4 samples, as well as their periodically poled variants. Specifically, we study the altered transmission due to color-center formation via gamma irradiation. We measured the transmission of our samples for varying radiation doses and demonstrate effective temperature annealing of gamma radiation induced color centers. We measured a maximum transmission difference of 2% in our samples, which was easily corrected with temperature annealing. No long term and permanent changes were found to be induced in our samples.

  • 15.
    Coetzee, Riaan Stuart
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Nanosecond laser induced damage thresholds in KTiOPO4 and Rb:KTiOPO4 at 1 µm and 2 µm2015In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 5, no 9, 2090-2095 p.Article in journal (Refereed)
    Abstract [en]

    Optimum design of high-energy cascaded parametric down-conversion schemes from 1 μm requires accurate knowledge of the laser induced damage threshold (LIDT) of the nonlinear crystal employed. We report surface LIDT measurements in KTiOPO4 (KTP) and Rb:KTP (RKTP) with nanosecond pulses at 1.064 μm and 2.1 μm. LIDT results for nanosecond pulses at 2 μm for KTP and RKTP have not been previously reported to the best of our knowledge.

  • 16.
    Coetzee, Riaan Stuart
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlotta
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laser Induced Damage Thresholds of KTP and RKTP2014Conference paper (Refereed)
  • 17.
    Coetzee, Riaan Stuart
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Melkonian, Jean-Michel
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    An efficient, 2 µm optical parametric amplifier based on large-aperture periodically poled Rb:KTP2016Conference paper (Refereed)
  • 18.
    Coetzee, Riaan Stuart
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    High-energy optical parametric amplifiers in the mid-infrared with large-aperture periodically poled Rb:KTiOPO42016Conference paper (Refereed)
    Abstract [en]

    Parametric down-conversion and amplication schemes are oŸen utilized to obtain high-energy, nanosecond pulses deep within the mid-infrared. We present a high-energy, 2 μm master oscillator power amplier (MOPA) based on large-aperture periodically poled Rb:KTP. A maximum output energy of 52 mJ was obtained with a conversion e›ciency of 40 %.

  • 19.
    Coetzee, Riaan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laser induced damage thresholds at 1 µm and 2 µm for undoped and Rb-doped KTiOPO4 [invited]2015Conference paper (Refereed)
  • 20. Eismann, U.
    et al.
    Gerbier, F.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Trenec, G.
    Vigue, J.
    Chevy, F.
    Salomon, C.
    An all-solid-state laser source at 671 nm for cold-atom experiments with lithium2012In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 106, no 1, 25-36 p.Article in journal (Refereed)
    Abstract [en]

    We present an all-solid-state narrow-linewidth laser source emitting 670 mW output power at 671 nm delivered in a diffraction-limited beam. The source is based on a frequency-doubled diode-end-pumped ring laser operating on the 4F 3/2 → 4I 13/2 transition in Nd:YVO 4. By using periodically poled potassium titanyl phosphate (ppKTP) in an external buildup cavity, doubling efficiencies of up to 86% are obtained. Tunability of the source over 100 GHz is accomplished. We demonstrate the suitability of this robust frequency-stabilized light source for laser cooling of lithium atoms. Finally, a simplified design based on intracavity doubling is described and first results are presented.

  • 21. Hart, James L.
    et al.
    Liu, Shi
    Lang, Andrew C.
    Hubert, Alexander
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Beanland, Richard
    Rappe, Andrew M.
    Arredondo, Miryam
    Taheri, Mitra L.
    Electron-beam-induced ferroelectric domain behavior in the transmission electron microscope: Toward deterministic domain patterning2016In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 94, no 17, 174104Article in journal (Refereed)
    Abstract [en]

    We report on transmission electron microscope beam-induced ferroelectric domain nucleation and motion. While previous observations of this phenomenon have been reported, a consistent theory explaining induced domain response is lacking, and little control over domain behavior has been demonstrated. We identify positive sample charging, a result of Auger and secondary electron emission, as the underlying mechanism driving domain behavior. By converging the electron beam to a focused probe, we demonstrate controlled nucleation of nanoscale domains. Molecular dynamics simulations performed are consistent with experimental results, confirming positive sample charging and reproducing the result of controlled domain nucleation. Furthermore, we discuss the effects of sample geometry and electron irradiation conditions on induced domain response. These findings elucidate past reports of electron beam-induced domain behavior in the transmission electron microscope and provide a path towards more predictive, deterministic domain patterning through electron irradiation.

  • 22.
    Jang, Hoon
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Strömqvist, Gustav
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Enhanced Backward Stimulated Raman Scattering in Periodically Poled KTiOPO42012Conference paper (Refereed)
  • 23.
    Jang, Hoon
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Viotti, Anne-Lise
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Strömqvist, Gustav
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Counter-propagating parametric interaction with phonon-polaritons in periodically poled KTiOPO42017In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, no 3, 2677-2686 p.Article in journal (Refereed)
    Abstract [en]

    Strongly enhanced backward stimulated polariton scattering (BSPS) is demonstrated in periodically-poled KTiOPO4 (KTP) crystals with a high power-conversion efficiency up to 70%. We study the physical mechanism of such counter-propagating parametric interaction with phonon-polaritons in χ(2) modulated structures. BSPS is a three-wave mixing that is distinguished from backward stimulated Raman scattering (BSRS), while a strong absorption at large polariton wave-vectors can still make BSPS display certain characteristics of BSRS such as self-compression of the Stokes pulse. We also compare BSPS with counter-propagating parametric oscillation in the near- and mid-infrared range, providing an estimation of the fabrication error margin to expect the outcome of their competition in the same device.

  • 24.
    Jang, Hoon
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Highly efficient backward stimulated polariton scattering in periodically poled KTiOPO42015In: CLEO: Science and Innovations 2015, 2015Conference paper (Refereed)
    Abstract [en]

    X(2)-nonlinearity enhanced by crystal lattice contribution in the THz-region is behind backward stimulated polariton scattering with efficiencies exceeding 50% in PPKTP where forward scattering process is suppressed. 10-times compression of counter-propagating signal is observed.

  • 25.
    Kianirad, Hoda
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zakauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Domain dynamics in Stoichiometric Lithium Tantalate revealed by etching and on-line Second Harmonic Generation2015Conference paper (Refereed)
    Abstract [en]

    Periodically poled LiTaO3 has a shorter cut-off wavelength than KTP and LiNbO3, which makes this material attractive for UV generation. However, the standard congruent material suffers strongly from photorefractive damage which has limited its use in the UV. It is expected that stoichiometric LiTaO3 (SLT) would make a superior material in this context, as the defect concentration, which directly relates to the damage, is strongly reduced. Close to perfectly stoichiometric crystals can be obtained by post growth diffusion of Li2O into the crystal at high temperatures to compensate the Li2O deficiency, so called vapour transport equilibrated (VTE) SLT [1]. The coercive field is drastically reduced for SLT which facilitates the way for fabricating QPM devices [2]. However lower defects and reduced coercive field might cause instability for charged domain walls (DW) or walls that are not in their lowest energy state. Since the stability mechanism for VTE SLT is not very well known, its investigation would lead to improvement in device fabrication with short period and also helps to understand the DW dynamics.

     

    In this work, we study the impact of chemical etching after poling on domain stability of SLT. We show that chemical etching right after poling induced DW movement without any external field. We demonstrate that when the original DW configuration is head-to-head (HH) or tail-to-tail (TT), the DW movement results in backswitching or merging with neighboring domians, respectively. Our finding are monitored by in situ SHG during etching followed by characterization of the domain structure with optical microscopy. We also show that this behavior is independent of the domain orientation with respect the crystallographic axes.

  • 26.
    Kianirad, Hoda
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Domain dynamics in stoichiometric lithium tantalate revealed by wet etching and on-line second harmonic generation2017In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 121, no 18, 184103Article in journal (Refereed)
    Abstract [en]

    The effect of chemical etching on the stability of domains in periodically poled stoichiometric lithium tantalate is studied by on-line second harmonic generation and microscopy. It is found that wet etching directly after poling leads to domain-wall movement, resulting in back-switching or domain merging. Head-to-head domains tend to backswitch, while tail-to-tail domains merge. For samples where the domain structure stabilized for longer time, no domain motion is observed when etched.

  • 27.
    Kianirad, Hoda
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Domain engineering using Si-electrode stamp2016Conference paper (Refereed)
  • 28.
    Kianirad, Hoda
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    On the stability of periodically poled Lithium Tantalate2014Conference paper (Refereed)
  • 29.
    Kianirad, Hoda
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Frisk, Thomas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Contact poling of Rb:KTiOPO4 using a micro-structured silicon electrode2015In: Optics Express, ISSN 1094-4087, Vol. 23, no 2, 636-641 p.Article in journal (Refereed)
    Abstract [en]

    A contact poling technique for domain engineering of ferroelectrics using a micro-structured silicon electrode is demonstrated on Rb:KTiOPO4. High quality QPM gratings were reproducibly fabricated. The silicon electrode is reusable and the technique potentially suitable when complex structures with sub-mu m features are to be domain engineered, which otherwise is incompatible with conventional photolithography. A non-negligible domain broadening was seen and attributed to a low nucleation rate using this type of electrode. However, under the appropriate poling conditions, this could be exploited to obtain a QPM grating with a short pitch (2 mu m), equal to half of the electrode period.

  • 30.
    Kianirad, Hoda
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Frisk, Thomas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Contact poling of RKTP using a micro-structured silicon electrode2014Conference paper (Other academic)
  • 31.
    Kianirad, Hoda
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Frisk, Thomas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Cell Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Contact poling of RKTP with silicon pillars2013In: 2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013, IEEE Computer Society, 2013, 6800873- p.Conference paper (Refereed)
    Abstract [en]

    Quasi-phase-matching (QPM) is a method to get tailored efficient second order nonlinear interactions [1]. Several techniques exist for fabrication of periodic domain structures in ferroelectric crystals for QPM frequency conversion. By far, electric field poling using lithographically patterned electrodes on the z-face of the crystal is the most common one [2]. High-quality periodically inverted ferroelectric domain structures in flux grown KTiOP 4 (KTP) crystals were fabricated already in the late 90's using this technique [3], and recently periodic domain sizes of few hundred nanometers were fabricated in 1 mm thick samples thanks to the quasi-one dimensional structure of KTP. It has recently also been shown that a slight Rb doping of the KTP crystal (RKTP) facilitates the periodic poling [4]. However, fabrication of two-dimensional (2D) domain structures in RKTP has not yet been investigated. A disadvantage with the lithographic patterning is that each sample needs to be patterned individually, which is tedious and time consuming. Moreover, when it comes to the small domain features, which are required by the next generation of nonlinear optical devices, a more versatile poling technique has to be developed due to the limitations of conventional photolithography. Structured silicon has been investigated as an alternative electrode for formation of 1D domains by contact poling in LiNb3 [5]. However, these electrodes were fabricated by wet etching and the sample thickness was limited to ∼200 μm.

  • 32. Kostyukova, Nadezhda Y.
    et al.
    Boyko, Andrey A.
    Marchev, Georgi M.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Kolker, Dmitry B.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Petrov, Valentin
    Rb: PPKTP Optical Parametric Oscillator with Intracavity Difference-Frequency Generation in AgGaSe22016In: 2016 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE conference proceedings, 2016Conference paper (Refereed)
    Abstract [en]

    A 1.064-mu m pumped Rb:PPKTP optical parametric oscillator (OPO) generates mid-IR radiation by intracavity mixing the signal and idler in AgGaSe2. The similar to 6-ns pulses at similar to 7 mu m have an energy of 565 mu J at 100 Hz.

  • 33.
    Laurell, Fredrik
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Liljestrand, Charlotte
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Nanodomain Engineered Ferroelectrics for Nonlinear Optical Applications2013In: Progress In Electromagnetics Research Symposium, 2013Conference paper (Other academic)
  • 34.
    Liljestrand, Charlotte
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    A highly efficient mirrorless optical parametricoscillator pumped by nanosecond pulsesIn: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794Article in journal (Refereed)
  • 35.
    Liljestrand, Charlotte
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Highly efficient mirrorless optical parametric oscillator pumped by nanosecond pulses2017In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 42, no 13, 2435-2438 p.Article in journal (Refereed)
    Abstract [en]

    A highly efficient mirrorless optical parametric oscillator (MOPO), pumped by narrowband nanosecond pulses at 1064 nm, is demonstrated. The MOPO is based on quasi-phase-matched parametric interaction of counter-propagating photons in 1-mm-thick periodically poled Rb-doped KTiOPO4 crystal with a period of 755 nm. It generates a co-propagating signal at 1740 nm and a counter-propagating idler at 2741 nm, achieving mJ-level output with a total signal-and-idler conversion efficiency of 47%. Both generated waves present narrow spectral bandwidths, thanks to the unique properties of the counter-propagating nonlinear interaction. The high conversion efficiency, inherently narrow spectral width, and simplicity of the optical setup make the MOPO an attractive alternative to conventional co-propagating optical parametric oscillators.

  • 36.
    Lindgren, Gustav
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pena, Alexandra
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Liljestrand, Charlotte
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Menaert, Bertrand
    Boulanger, Benoit
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thermal stability of ferroelectric domain gratings in Rb-doped KTP2015In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 107, no 8, 082906Article in journal (Refereed)
    Abstract [en]

    We study the thermal stability of domain walls in periodically poled Rb-doped KTP crystals. Domain-wall motion is observed after annealing the crystals above 550 degrees C. This motion is highly anisotropic along the a- and b- crystallographic axes. Along the b-axis domain wall motion is in the order of tens of micrometers. In the a-direction, it results in either three orders of magnitude smaller domain wall displacement or in domain merging, depending on the initial domain configuration. We show that the thermal stability of the domain gratings depends on their periodicity, resulting in complete backswitching for sub-micrometer domains annealed at 730 degrees C.

  • 37.
    Lindgren, Gustav
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Peña, A.
    Zakauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Liljestrand, Charlotte
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Ménaert, B.
    Boulanger, B.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thermal stability of ferroelectric domain gratings in Rbdoped KTiOPO42015In: Advanced Solid State Lasers, ASSL 2015, Optical Society of America, 2015Conference paper (Refereed)
    Abstract [en]

    We study the thermal stability of domain walls in periodically poled Rb-doped KTP crystals as a function of domain grating periodicity. Complete back-switching was observed by optical microscopy for sub-micrometer domains annealed at 730 °C.

  • 38.
    Lindgren, Gustav
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Studies of sub millisecond domain dynamics in rubidium doped KTP, using real-time in-situ SHG2013In: CLEO: Science and Innovations, CLEO_SI 2013, IEEE conference proceedings, 2013, CW3B.2- p.Conference paper (Refereed)
    Abstract [en]

    We demonstrate real-time, in-situ SHG as a technique for studying the sub-millisecond dynamics of periodic poling in Rb-doped KTP. Using this technique we established the parameters which have the most influence on the domain dynamics. OCIS codes: (190.4400) Nonlinear optics, materials; (160.2260) Ferroelectrics.

  • 39.
    Lindgren, Gustav
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Studies of sub-millisecond domain dynamics in periodically poled Rb-doped KTiOPO4, using online in situ second harmonic generation2015In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, no 16, 20332-20339 p.Article in journal (Refereed)
    Abstract [en]

    The temporal evolution of in situ second-harmonic generation was employed to study domain dynamics during periodic poling in Rb-doped KTP. With this method we investigated the influence of various poling parameters, including electric-field pulse shape, pulse magnitude, and number of pulses, on the quality of the QPM structure. It was found that the grating formation can be a sub-millisecond process and the benefits of using symmetric triangular electric-field pulse shape over square pulse shape in the single-pulse poling regime were demonstrated. Multiple-pulse poling with triangular pulses was shown to have a detrimental effect on the QPM structure quality, while multiple square pulses can provide additional flexibility to the structuring process.

  • 40. Masiello, Fabio
    et al.
    Lafford, Tamzin A.
    Pernot, Petra
    Baruchel, Jose
    Keeble, Dean S.
    Thomas, Pam A.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Strömqvist, Gustav
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Investigation by coherent X-ray section topography of ferroelectric domain behaviour as a function of temperature in periodically poled Rb:KTP2011In: Journal of applied crystallography, ISSN 0021-8898, E-ISSN 1600-5767, Vol. 44, 462-466 p.Article in journal (Refereed)
    Abstract [en]

    The behaviour of ferroelectric domains at high temperatures near the Curie temperature in a periodically poled rubidium-doped potassium titanyl phosphate crystal (Rb:KTP) has been studied by Bragg-Fresnel X-ray diffraction imaging in situ using a compact coherence-preserving furnace. The development and partial disappearance of the inverted domain structure as the temperature increases has been successfully modelled, and is explained by invoking a built-in electric field produced under heating in a low vacuum by out-diffusion of atoms from the sample.

  • 41.
    Meiser, Niels
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Seger, Kai
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Cascaded mode-locking of a spectrally controlled Yb: KYW laser2014In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 116, no 2, 493-499 p.Article in journal (Refereed)
    Abstract [en]

    Self-starting and stable mode-locking of an Yb:KYW laser in the picoseconds pulse regime has been achieved by exploiting a positive cascaded Kerr lens in periodically poled KTP. The use of a volume Bragg grating (VBG), for locking the output spectrum of the laser, was essential to achieve a stable mode-locked operation in this wide gain bandwidth laser material. The laser emitted stable, nearly transform-limited pulses with a duration of 16 ps, at a repetition rate of 210 MHz, and with an energy of 3.2 nJ. The mode-locked spectrum was centred at 1,029.1 nm and featured a FWHM bandwidth of 85 pm, which was effectively determined by the VBG. Combination of a large cascaded Kerr nonlinearity with spectral limiting by a VBG represents so far the best opportunity for stable mode-locking of a broadband laser to produce near-transform-limited picosecond pulses.

  • 42.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Development of high-energy mid-infrared parametric sources using structured nonlinear materials2013In: The 21th annual International Conference on Advanced Laser Technologies (ALT’13). Budva, Montenegro, September 16–20, 2013. Book of abstracts, 2013Conference paper (Refereed)
  • 43. Petrov, V.
    et al.
    Boyko, A. A.
    Kostyukova, N. Y.
    Marchev, G. M.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kolker, D. B.
    Badikov, V.
    Badikov, D.
    Shevyrdyaeva, G.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Panyutin, V.
    Frequency down-conversion of 1 μm laser radiation to the mid-IR using non-oxide nonlinear crystals in a cascaded intracavity configuration2017In: Proceedings of SPIE - The International Society for Optical Engineering, SPIE - International Society for Optical Engineering, 2017, Vol. 10088, 1008810Conference paper (Refereed)
    Abstract [en]

    A singly-resonant OPO (SRO) based on AgGaSe2 (AGSe) intracavity pumped at ∼1.85 μm by the signal pulses of a Rb:PPKTP doubly-resonant OPO (DRO) provided extremely broad tuning (5.8 to ∼18 μm) for the non-resonated idler. In a similar set-up with the same nonlinear crystals, we studied intracavity difference-frequency generation (DFG). Both AGSe and the new monoclinic crystal BaGa4Se7 (BGSe) generated single pulse energies of ∼0.7 mJ near 7 μm at an overall conversion efficiency from the 1.064 μm pump of 1.2%. The main advantage of BGSe is its damage resistivity up to the maximum pump levels applied at 100 Hz.

  • 44.
    Seger, Kai
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Meiser, Niels
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tjörnhammar, Staffan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canilias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Intra-cavity frequency-doubled Yb: KYW laser using periodically poled Rb-doped KTP with a volume Bragg grating input coupler2014In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 115, no 2, 161-166 p.Article in journal (Refereed)
    Abstract [en]

    An Yb:KYW laser intra-cavity frequency doubled to the green at 514.7 nm using a periodically poled Rb:KTP crystal with an output power exceeding 1 W is presented. Spectral narrowing and locking at the fundamental wavelength has been achieved by using a volume Bragg grating as the input coupler.

  • 45. Stoeppler, G.
    et al.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Eichhorn, M.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Mid-infrared cascaded parametric source in 6 μm region for medical applications2012In: 2012 Conference on Lasers and Electro-Optics, CLEO 2012, New York: IEEE , 2012, 6325539- p.Conference paper (Refereed)
    Abstract [en]

    All-diode-pumped parametric source generating 5ns pulses tunable in 6.27μm-8.12μm with high-spatial-quality beam and the pulse energy of 0.9 mJ is demonstrated. The device exploits large-aperture PPRKTP MOPA for pumping ZGP OPO in a RISTRA cavity.

  • 46.
    Stoeppler, Georg
    et al.
    French–German Research Institute of Saint Louis ISL.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Eichhorn, Marc
    French–German Research Institute of Saint Louis ISL.
    Tunable Mid-infrared ZnGeP2 RISTRA OPO pumped by periodically-poled Rb:KTP optical parametric master-oscillator power amplifier2012In: Optics Express, ISSN 1094-4087, Vol. 20, no 4, 4509-4517 p.Article in journal (Refereed)
    Abstract [en]

    A laser-diode pumped Q-switched single-frequency Nd:YAG MOPA operating at 100 Hz was used to generate tunable mid-infrared radiation between 6.27 µm and 8.12 µm by employing a cascaded parametric arrangement consisting of degenerate parametric master-oscillator power amplifier using a large aperture periodically-poled Rb:KTiOPO4 which in turn pumped a ZnGeP2 (ZGP) nonplanar RISTRA OPO. The noncollinear ZGP RISTRA tuning behavior is elucidated. The device is aimed for minimally invasive surgery applications at 6.45 µm where the peak power of 193 kW in 5 ns pulses is demonstrated.

  • 47.
    Thilmann, Nicky
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Stoeppler, Georg
    French–German Research Institute of Saint Louis ISL.
    Eichhorn, Marc
    French–German Research Institute of Saint Louis ISL.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    ZnGeP2 RISTRA OPO in the mid-IR Region Pumped by a Periodically Poled KTiOPO4 Master-Oscillator Power Amplifier2012Conference paper (Refereed)
  • 48.
    Thilmann, Nicky
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Strömqvist, Gustav
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Jacobsson, Björn
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Optical parametric oscillator at 2.1 µm with large aperture periodically poled KTiOPO42010In: 4th EPS-QEOD Europhoton Conference: Solid-state, fibre, and waveguide coherent light sources, 2010Conference paper (Refereed)
  • 49.
    Tjörnhammar, Staffan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Maestroni, Valerio
    KTH, School of Engineering Sciences (SCI), Applied Physics. bPolitecnico di Milano, Italy.
    Uždavinys, Tomas Kristijonas
    KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Blue light induced infrared absorption and color-center fluorescence in ktp isomorphs2015In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2015Conference paper (Refereed)
  • 50.
    Tjörnhammar, Staffan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Maestroni, Valerio
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Politecnico di Milano.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Blue-light induced infrared absorption in KTiOPO4 isomorphs2016Conference paper (Refereed)
12 1 - 50 of 83
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