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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. Baek, I. H.
    et al.
    Choi, S. Y.
    Lee, H. W.
    Cho, W. B.
    Petrov, V.
    Agnesi, A.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Yeom, D. -I
    Kim, K.
    Hong, B. H.
    Rotermund, F.
    Passive mode-locking of a Ti: Sapphire laser using low-dimensional carbon nanostructures2011In: Int. Quantum Electron. Conf., IQEC Conf. Lasers Electro-Opt., CLEO Pac. Rim. Incorporating Australas. Conf. Opt., Lasers Spec, 2011, 1154-1155 p.Conference paper (Refereed)
    Abstract [en]

    We report on passive mode-locking of a Ti:sapphire laser employing novel saturable absorbers based on low-dimensional carbon nanostructures such as single-walled carbon nanotubes and monolayer graphene. The mode-locked operation with both saturable absorbers were characterized and compared to pure Kerr-lens mode-locking.

  • 5. Baek, In Hyung
    et al.
    Choi, Sun Young
    Lee, Hwang Woon
    Cho, Won Bae
    Petrov, Valentin
    Agnesi, Antonio
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Yeom, Dong-Il
    Kim, Kihong
    Rotermund, Fabian
    Single-walled carbon nanotube saturable absorber assisted high-power mode-locking of a Ti:sapphire laser2011In: Optics Express, ISSN 1094-4087, Vol. 19, no 8, 7833-7838 p.Article in journal (Refereed)
    Abstract [en]

    We report on passive mode-locking of a Ti:sapphire laser employing a single-walled carbon nanotube saturable absorber (SWCNT-SA) specially designed and fabricated for wavelengths near 800 nm. Mode-locked pulses as short as 62 fs were generated at a repetition rate of 99.4 MHz. We achieved output powers from the SWCNT-SA mode-locked laser as high as 600 mW with a slope efficiency of 26%. The characteristics of SWCNT-SA-assisted mode-locking were compared with those of Kerr-lens mode-locking without SWCNT-SA.

  • 6. Bertani, Stefano
    et al.
    Jacobsson, Bjorn
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Stjernström, Mårten
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Analytical Chemistry (closed 20110630).
    Stretching-tunable external-cavity laser locked by an elastic silicone grating2006In: Optics Express, ISSN 1094-4087, Vol. 14, no 25, 11982-11986 p.Article in journal (Refereed)
    Abstract [en]

    We demonstrate wavelength locking of a diode laser at 760 nm with feedback from an elastic transmission grating in the Littrow configuration. The laser was in a single longitudinal mode with a side-mode suppression of 20 dB. By stretching the grating the laser could be tuned over a few nm. The grating was fabricated in a silicone elastomer ( polydimethylsiloxane) by a moulding technique, and coated by a thin layer of Ti and Au to achieve an increased diffraction efficiency needed for efficient locking.

  • 7.
    Bjurshagen, Stefan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Brynolfsson, Patrik
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Parreu, I.
    Pujol, M. C.
    Peña, A.
    Aguiló, M.
    Díaz, F.
    Crystal growth, spectroscopic characterization, and eye-safe laser operation of erbium- And ytterbium-codoped KLu(WO4)22008In: Applied Optics, ISSN 1559-128X, Vol. 47, no 5, 656-665 p.Article in journal (Refereed)
    Abstract [en]

    Erbium (Er)- and Ytterbium (Yb)-codoped monoclinic KLu(WO4) 2 single crystals were grown by top seeded solution growth-slow cooling method for several different doping concentrations. Growth parameters have been optimized to obtain macrodefect-free single crystals. Er energy levels involved in the 4I13/2 → 4I 15/2 were determined by 6 K polarized optical absorption. The maximum emission cross section for this electronic transition has been evaluated, being 2.85 × 10-20 cm2 for E||Nm at 1535 nm. Laser oscillation in the 1.5 μm range was obtained by pumping the Yb ion at 980 nm and sensitizing Er. The maximum output power achieved was 152 mW, with 1.2% slope efficiency.

  • 8.
    Bjurshagen, Stefan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Hellström, Jonas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pujol, Maria
    Fisica I Cristal-Lografia de Materials (FiCMA), Universitat Rovira I Virgili, Spain.
    Aguiló, Magdalena
    Fisica I Cristal-Lografia de Materials (FiCMA), Universitat Rovira I Virgili, Spain.
    Díaz, Francesc
    Fisica I Cristal-Lografia de Materials (FiCMA), Universitat Rovira I Virgili, Spain.
    Fluorescence dynamics and rate equations analysis in Er3+,Yb3+ doped double tungstates2006In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 45, no 19, 4715-4725 p.Article in journal (Refereed)
    Abstract [en]

    The fluorescence dynamics in Er3+ and Yb3+ doped KGd(WO4)(2) and KY(WO4)(2) has been investigated. Lifetimes have been measured for the Yb(F-2(5/2)), Er(I-4(13/2)), and Er(S-4(3/2)) levels around 1, 1.5, and 0.55 mu m, respectively. The Yb(F-2(5/2)) lifetimes show a decreasing trend toward the limiting Er(I-4(11/2)) lifetime with increasing Er-to-Yb concentration ratio, whereas the Er(I-4(13/2)) lifetimes are mostly unaffected by the doping concentrations. A rate equation analysis has been performed to explain the observed behavior and gain is calculated for a continuous-wave laser at 1.53 mu m to find the optimum doping concentrations for high gain.

  • 9.
    Bjurshagen, Stefan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Parreu, I.
    University of Tarragona.
    Pujol, M. C.
    University of Tarragona.
    Aguiló, M.
    University of Tarragona.
    Diaz, Francesc
    University of Tarragona.
    Crystal Growth, Spectroscopic Characterisation and Eye-Safe Laser Operation of Er and Yb Doped KLu(WO4)22008Conference paper (Refereed)
    Abstract [en]

    High quality Er:Yb:KLu(WO4)2have been grown using TSSG method and spectroscopically investigated . The laser performance is compared with that in Er:Yb:KY(WO4)2. Role of upconversion processes and optimum doping concentrations have been estimated.

  • 10. Bolanos, Western
    et al.
    Carvajal, Joan J.
    Mateos, Xavier
    Cinta Pujol, Maria
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Lifante, Gines
    Aguilo, Magdalena
    Diaz, Francesc
    Epitaxial layers of KY1-x-yGdxLuy(WO4)(2) doped with Er3+ and Tm3+ for planar waveguide lasers2010In: Optical materials (Amsterdam), ISSN 0925-3467, Vol. 32, no 3, 469-474 p.Article in journal (Refereed)
    Abstract [en]

    Here we show the results we obtained in the fabrication of planar wave guide lasers based on monoclinic double tungstates doped with Er3+ and Tm3+. We have successfully introduced these ions into the lattice matched KY0.59Gd0.19Lu0.22(WO4)(2) epitaxial layers grown on KY(WO4)(2) substrates without loss of optical quality and keeping a high refractive index contrast between the epitaxial layer and the substrate. We characterized the waveguiding properties of these epitaxial layers at lambda = 632.8 nm by dark modes spectroscopy, and we showed that these waveguides can support several TE and TM modes. Spectroscopic characterization of the active lanthanide ions in these crystals is also presented.

  • 11. Bolaños, W.
    et al.
    Carvajal, J.J.
    Mateos, X.
    Pujol, M.C.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Aguiló, M.
    Díaz, F.
    Fabrication and characterization of epitaxial layers of the KY1-x-yGdxLuy(WO4)2 system for waveguide lasers2009Conference paper (Refereed)
  • 12. 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.

  • 13. 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. 

  • 14. 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.

  • 15. 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.

  • 16. 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%.

  • 17. 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.

  • 18. Campbell, S.
    et al.
    Thomson, R. R.
    Hand, D. P.
    Kar, A. K.
    Reid, D. T.
    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.
    Frequency-doubling in femtosecond laser inscribed periodically-poled potassium titanyl phosphate waveguides2007In: Optics Express, ISSN 1094-4087, Vol. 15, no 25, 17146-17150 p.Article in journal (Refereed)
    Abstract [en]

    Frequency doubling has been achieved in femtosecond-laser-inscribed single-mode waveguides written in two periodically-poled potassium titanyl phosphate crystals. A conversion efficiency of 0.22 %W-1 was obtained for first-order quasi-phase matching at 980 nm and an efficiency of 0.02 %W-1 for third-order quasi-phase matching at 800 nm.

  • 19.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Hirohashi, Junji
    KTH, School of Engineering Sciences (SCI), Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Physics.
    Polarization switching characteristics of flux grown KTiOPO4 and RbTiOPO4 at room temperature2005In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 97, no 12, 124105- p.Article in journal (Refereed)
    Abstract [en]

    A study of polarization-switching characteristics under an applied electrical field at room temperature is presented for flux-grown KTiOPO4 and RbTiOPO4. By optimizing the experimental conditions, we determined the coercive field and the domain-switching time quantitatively by direct observation of the switching current. For both isomorphs, the inverse of the polarization-switching time, 1/t(s), follows an exponential dependence on the applied field E in low-field regime, and a linear dependence on E in the high-field regime. Domain morphology of KTiOPO4 based on selective etching reveals laminar structures elongated in the b crystallographic direction. An estimation of the domain-wall velocity shows that the domain speed in the polar direction is, at least, two orders of magnitude larger than in the a-b plane. The velocity along the b direction is similar to 30 times larger than along the a axis.

  • 20.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Nordlöf, Mats
    KTH, School of Engineering Sciences (SCI), Applied 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.
    A KTiOPO4 nonlinear photonic crystal for blue second harmonic generation2009In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 94, no 8Article in journal (Refereed)
    Abstract [en]

    A nonlinear photonic crystal with a rectangular domain lattice of 6.09x6 mu m(2) has been fabricated and characterized in flux-grown KTiOPO4. It was used to demonstrate continuous-wave and multiple beam tunable blue second harmonic generation.

  • 21.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Nordlöf, Mats
    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.
    Two-Dimensional Nonlinear Photonic Crystal in KTiOPO4 for CW Second Harmonic Blue Light Generation2007In: 2007 CONFERENCE ON LASERS & ELECTRO-OPTICS/QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2007), NEW YORK: IEEE , 2007, 404-405 p.Conference paper (Refereed)
    Abstract [en]

    We report on fabrication and characterization of a nonlinear photonic crystal with a rectangular lattice in a KTiOPO4 crystal. The structure was used to demonstrate CW tunable second harmonic generation in the blue regime.

  • 22.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Counter-Propagating QPM Parametric Interactions: A Mirrorless OPO in sub-µm Periodically Poled KTiOPO42007Conference paper (Refereed)
    Abstract [en]

    We report on the first experimental demonstration of mirrorless optical parametric oscillation. The counter-propagating idler and signal oscillate without an external cavity in a sub-µm periodically poled KTiOPO4 crystal, reaching an efficiency of 16.5%.

  • 23.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Mirrorless optical parametric oscillator2007In: Nature Photonics, ISSN 1749-4885, Vol. 1, no 8, 459-462 p.Article in journal (Refereed)
    Abstract [en]

    Parametric interaction of counterpropagating photons has the unique property of automatically establishing distributed feedback and thus realizing novel sources of coherent and tunable radiation, such as mirrorless optical parametric oscillators. This device does not require alignment or any optical components other than the second-order nonlinear medium itself(1). Here we present the first experimental demonstration of such an oscillator, which was made feasible by quasi phase-matching in a nonlinear photonic structure with submicrometre periodicity. This type of oscillator has been extensively discussed as a theoretical possibility(1-5). It generates signal and idler waves in the near- and mid-infrared, respectively, and exhibits unique and useful spectral properties. The oscillator signal is essentially a wavelength-shifted replica of the pump spectrum, and the bandwidth of the idler is two orders of magnitude narrower than that of the pump. It also has very low output wavelength sensitivity to temperature variations.

  • 24.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Clemens, R.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Sub-micronperiodically poled flux grown KTiOPO4 for optical applications2003Conference paper (Refereed)
  • 25.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Clemens, R.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Sub-micronperiodically poled flux-grown KTiOPO4 for optical applications2003Conference paper (Refereed)
  • 26.
    Canalias, Carlota
    et al.
    KTH, Superseded Departments, Physics.
    Pasiskevicius, Valdas
    KTH, Superseded Departments, Physics.
    Clemens, Rosalie
    KTH, Superseded Departments, Physics.
    Laurell, Fredrik
    KTH, Superseded Departments, Physics.
    Submicron periodically poled flux-grown KTiOPO42003In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 82, no 24, 4233-4235 p.Article in journal (Refereed)
    Abstract [en]

    A submicron domain grating has been created in a bulk ferroelectric. Electron-beam lithography and electric-field poling were used to fabricate the 800 nm period grating in a 0.5-mm-thick flux-grown KTiOPO4 sample. The domain structure was characterized with an atomic force microscope and was used to demonstrate electrically amplitude adjustable Bragg reflections.

  • 27.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Physics.
    Fokine, Michael
    KTH, School of Engineering Sciences (SCI), Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Physics.
    Backward quasi phase matched second harmonic generation in sub-micron periodically poled KTiOPO42005In: 2005 Conference on Lasers & Electro-Optics (CLEO), Vols 1-3, WASHINGTON: OPTICAL SOC AMERICA , 2005, 2264-2266 p.Conference paper (Refereed)
    Abstract [en]

    1mm thick KTiOPO4 was poled with 720nm domain period by employing UV-lithography, chemical patterning and electric field poling. The structure was used to demonstrate 6 and 7 order quasi-phase matched backward second harmonic generation.

  • 28.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Fokine, Michael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Backward quasi phase matched second harmonic generation in sub-micron periodically poled KTiOPO42006In: CLEO/QELS 2006, Optical Society of America, 2006Conference paper (Refereed)
    Abstract [en]

    1mm thick KTiOPO4 was poled with 720nm domain period by employing UVlithography, chemical patterning and electric field poling. The structure was used to demonstrate 6 and 7 order quasi-phase matched backward second harmonic generation.

  • 29.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Fokine, Michael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Backward quasi-phase-matched second-harmonic generation in submicrometer periodically poled flux-grown KTiOPO42005In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 86, no 18, 181105-1-181105-3 p.Article in journal (Refereed)
    Abstract [en]

    A 1 turn thick flux-grown KTiOPO4 sample was poled with a 720 nm domain period by employing deep-UV laser lithography, chemical patterning, and electric field poling. An atomic force microscope was used to characterize the periodic domain structure. The sample was used to demonstrate sixth and seventh order quasi-phase-matched backward second-harmonic generation.

  • 30.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Fokine, Michael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Progress in Sub-Micrometer Periodicity of Quasi-Phase Matching Structures2009In: 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum Electronics and Laser Science Conference, CLEO/QELS 2009, IEEE , 2009, 906-907 p.Conference paper (Refereed)
    Abstract [en]

    We report on the progress in fabrication of sub-micrometer ferroelectric domain gratings in KTiOPO4. Periods as short as 565 nm have been created in the bulk of the crystal by electric-filed poling.

  • 31.
    Canalias, Carlota
    et al.
    KTH, Superseded Departments, Physics.
    Pasiskevicius, Valdas
    KTH, Superseded Departments, Physics.
    Fragemann, Anna
    KTH, Superseded Departments, Physics.
    Laurell, Fredrik
    KTH, Superseded Departments, Physics.
    High-resolution domain imaging on the nonpolar y-face of periodically poled KTiOPO4 by means of atomic force microscopy2003In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 83, no 4, 734-736 p.Article in journal (Refereed)
    Abstract [en]

    The inverse piezoelectric effect is used to produce high-resolution images of ferroelectric domains in periodically poled KTiOPO4 crystals on their nonpolar y-face using atomic force microscopy. We demonstrate that the technique is convenient for studying the nucleation and growth of domains in a periodically poled KTiOPO4 sample.

  • 32.
    Canalias, Carlota
    et al.
    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.
    Advances in KTP-Family Materials2007Conference paper (Refereed)
  • 33.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Physics.
    Periodic poling of KTiOPO4: From micrometer to sub-micrometer domain gratings2006In: Ferroelectrics (Print), ISSN 0015-0193, Vol. 340, no 1, 27-47 p.Article in journal (Refereed)
    Abstract [en]

    Some novel techniques to do periodic poling of KTP are described. Emphasis on ways to avoid domain broadening and merging of domains is presented with reference to the original properties of flux grown KTP. For sub-Am structures E-beam lithography and deep UV-laser lithography were used to pattern the samples, and chemical process to promote selective poling to obtain high quality domain gratings in up to 1 mm thick samples.

  • 34.
    Canalias, Carlota
    et al.
    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.
    Periodical domains gratings go nano2009Conference paper (Refereed)
  • 35.
    Canalias, Carlota
    et al.
    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-µmperiodically poled KTiOPO42009Conference paper (Refereed)
  • 36.
    Canalias, Carlota
    et al.
    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.
    Grilli, Simonetta
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    De Natale, P.
    Ferraro, P.
    In situ visualization of domain kinetics in flux grown KTiOPO4 by digital holography2007In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 102, no 6, 064105- p.Article in journal (Refereed)
    Abstract [en]

    The fast dynamic evolution of ferroelectric domains during electric field poling in flux grown KTiOPO4 crystals was investigated online by a digital holography based technique. The dependence of the ferroelectric domain kinetics on the electric field temporal wave form and poling history was studied. High-speed imaging by means of a complementary metal-oxide-semiconductor image sensor camera allowed in situ measurement of the domain wall propagation speed under different poling conditions. The results also give evidence of the strong influence of the dielectric surface layer in this material.

  • 37.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Nordlöf, M.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Domain engineering in KTiOPO4: from periodic poling to self-assembled2007Conference paper (Refereed)
  • 38.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Strömqvist, Gustav
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Mirrorless optical parametric oscillators2010In: Nonlinear Photonics (NP) 2010, 2010Conference paper (Refereed)
    Abstract [en]

    We present the experimental implementation of a mirrorless optical parametric oscillator based on sub-μm periodically poled KTiOPO4. The poling process for sub-μm gratings and the unique properties of the device will be discussed.

  • 39.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Wang, Shunhua
    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.
    Nucleation and growth of periodic domains during electric field poling in flux-grown KTiOPO4 observed by atomic force microscopy2006In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 88, no 3, 032905-1-032905-3 p.Article in journal (Refereed)
    Abstract [en]

    The domain structure of periodically poled KTiOPO4 crystals were studied on both the polar and nonpolar faces utilizing a voltage-modulated atomic force microscope. The measurements give information of domain nucleation, growth, and merging. Two different kind of overpoling behaviors have been observed depending on the magnitude of the applied field.

  • 40.
    Canalias, Carlota
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    Liljestrand, Charlotte
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Advances in QPM Devices Based on KTP Isomorphs2013Conference paper (Refereed)
  • 41.
    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.

  • 42.
    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.

  • 43. Chaitanya Kumar, S.
    et al.
    Samanta, G. K.
    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.
    Ebrahim-Zadeh, M.
    6.2 W, Continuous-Wave, Single-Frequency, Yb-Fiber-Based Green Source at 532 nm Using Periodically-Poled KTiOPO42009Conference paper (Refereed)
  • 44. Chuchumishev, D.
    et al.
    Marchev, G.
    Bucharov, I.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, V.
    Sub-ns OPO based on PPKTP with 1 mJ Idler Energy at 2800 nm2013Conference paper (Refereed)
  • 45. Chuchumishev, D.
    et al.
    Marchev, G.
    Buchvarov, I.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, V.
    High-energy picosecond OPO based on PPKTP2013In: Laser Physics Letters, ISSN 1612-2011, Vol. 10, no 11, 115404- p.Article in journal (Refereed)
    Abstract [en]

    Output energy of 1 mJ is obtained for the 380 ps long idler pulses at 2800 nm from a short cavity singly resonant 500 Hz optical parametric oscillator employing PPKTP and a near-diffraction-limited, single frequency, sub-nanosecond pump source at 1064 nm.

  • 46. Chuchumishev, Danail
    et al.
    Marchev, Georgi
    Buchvarov, Ivan
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, Valentin
    Sub-ns OPO based on PPKTP with 1 mJ Idler Energy at 2.8 mu m2013In: 2013 CONFERENCE ON AND INTERNATIONAL QUANTUM ELECTRONICS CONFERENCE LASERS AND ELECTRO-OPTICS EUROPE (CLEO EUROPE/IQEC), IEEE conference proceedings, 2013Conference paper (Refereed)
  • 47.
    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.

  • 48.
    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.

  • 49.
    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.

  • 50.
    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.

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