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  • 1. 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, E-ISSN 1873-1252, Vol. 32, no 3, p. 469-474Article 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.

  • 2. 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)
  • 3.
    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, article id 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.

  • 4.
    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.

  • 5.
    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, p. 2090-2095Article 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.

  • 6.
    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)
  • 7.
    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)
  • 8.
    Jacobsson, Björn
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    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.
    Narrowband and tunable optical parametric oscillator near and at degeneracy using a transversely chirped Bragg grating2009Conference paper (Refereed)
    Abstract [en]

    We demonstrate locking and tuning of a nanosecond optical parametric oscillators near and at degeneracy with oscillating wavelengths from 1000 to 1066 nm using transversely chirped Bragg gratings. The signal had bandwidths of <0.6 nm and energies of ~0.4 mJ.

  • 9. Marchev, G.
    et al.
    Dallocchio, P.
    Pirzio, F.
    Agnesi, A.
    Reali, G.
    Petrov, V.
    Tyazhev, A.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Non-critical OPO based on periodically-poled KTP crystal generating ∼ 250 ps idler pulses at 1-10 kHz2012In: 2012 Conference on Lasers and Electro-Optics, CLEO 2012, 2012, p. 6325884-Conference paper (Refereed)
    Abstract [en]

    Idler pulses at 2.8 μm with energy of ∼ 50 μJ and ∼ 250 ps pulse duration are obtained from a short-cavity, singly-resonant OPO based on PPKTP, pumped by a 1-10 kHz, 500 ps, 1064 nm laser source.

  • 10. Marchev, G.
    et al.
    Petrov, V.
    Tyazhev, A.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Buchvarov, I.
    Sub-nanosecond, 1-kHz, low-threshold, non-critical OPO based on periodically-poled KTP crystal pumped at 1064 nm2012In: Nonlinear Frequency Generation And Conversion: Materials, Devices, And Applications XI / [ed] Vodopyanov, KL, SPIE - International Society for Optical Engineering, 2012, Vol. 8240, p. 82400D-Conference paper (Refereed)
    Abstract [en]

    We employed a 9-mm long periodically-poled KTiOPO 4 (PPKTP) crystal with a domain inversion period of 37.8 ÎŒm in an optical parametric oscillator (OPO) to generate sub-nanosecond pulses around 2.8 ÎŒm. With a 1-cm long OPO cavity in a singly resonant configuration with double pass pumping the OPO threshold was 110 ÎŒJ at 1064 nm (1-ns pump pulses at 1064 nm). The maximum idler output energy reached 110 ÎŒJ (quantum conversion efficiency of 32.5%). The signal pulse duration (FWHM) was 0.72 ns and the estimated idler pulse duration was 0.76 ns. At room temperature the signal and idler wavelengths were at 1722 and 2786 nm.

  • 11. Marchev, Georgi
    et al.
    Dallocchio, Paolo
    Pirzio, Federico
    Agnesi, Antonio
    Reali, Giancarlo
    Petrov, Valentin
    Tyazhev, Aleksey
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Sub-nanosecond, 1-10 kHz, low-threshold, non-critical OPOs based on periodically poled KTP crystal pumped at 1,064 nm2012In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 109, no 2, p. 211-214Article in journal (Refereed)
    Abstract [en]

    We employed a 9-mm long periodically poled KTiOPO4 (PPKTP) crystal in an optical parametric oscillator (OPO) to generate sub-nanosecond idler pulses around 2.8 mu m. With a 1-cm long OPO cavity in a singly resonant configuration and double pass pumping by 1-ns pulses at 1,064 nm, the maximum idler energy reached 110 mu J at 1 kHz. Pumping with 500 ps pulses at 1-10 kHz, resulted in an idler energy of similar to 50 mu J and the shortest pulse duration of similar to 250 ps, ever reported for an OPO. The corresponding quantum conversion efficiencies were 32.5 and 34.9 %, respectively.

  • 12.
    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)
  • 13. 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, p. 6325539-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.

  • 14.
    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, E-ISSN 1094-4087, Vol. 20, no 4, p. 4509-4517Article 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.

  • 15.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Highly efficient optical parametric oscillators in the mid-IR2014Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis shows how sources of coherent radiation in the mid-infrared (mid-IR) region can be enhanced. To achieve this, optical parametric oscillators (OPOs) employing improved novel materials, new optical elements, and novel cavity designs have been implemented. Moreover, important measurements for the development of ultrashort-pulsed lasers were conducted. In turn, such lasers are suitable pump sources for the nonlinear conversion to the mid-IR.

    The mid-infrared spectral region is of interest for many applications in the areas of medicine, sensing, climate monitoring, and ranging. Here the target wavelength 6.45μm was especially interesting since it is considered particularly useful in surgical applications. Commercially available lasers perform poorly as pump sources for the generation of this wavelength. Therefore, a superior cascaded conversion scheme with large aperture crystals was implemented. In these, Rb-doped KTiOPO4(KTP) was employed since it was found that Rb-doping improves the poling properties of KTP. Moreover, for the conversion scheme to be efficient, a narrow-band out putspectrum of the OPO is required. It was shown here that this can successfully be achieved by utilizing a volume Bragg grating (VBG).

    Alternatively, for the direct generation of mid-IR radiation, KTiOAsO4(KTA) crystals with an extended transmission into the mid-IR as compared to KTP have been investigated. Novel room-temperature periodic-poling of KTA was shown and the fabricated crystals were successfully employed in a highly-efficient OPO.

    The newly developed pump sources based on the Rb-doped KTP crystals were successfully implemented in a cascaded OPO experiment. Here, a so-called RISTRA cavity was employed and high-energy nanosecond pulses at 6.45μm with improved beam quality were demonstrated.

    Pulsed lasers emitting at around 1μm, e.g. Yb-doped host materials, are frequently employed as pump sources of nonlinear optical conversion schemes. To allow further development of ultrashort pulsed Yb-doped double tungstate lasers, the nonlinear refractive index of several materials was measured. Among these are new materials which were for the first time characterized with regard to their nonlinear refractive index.

    In addition to the pulsed experiments above, a periodically poled lithium niobate crystal was employed to generate continuous-wave output. Even here, a volume Bragg grating was implemented and thereby demonstrated a novel method to control the threshold of the OPO. Thus, a stable high-energy highly-efficient OPO could be demonstrated.

  • 16.
    Thilmann, Nicky
    et al.
    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.
    A narrowband optical parametric oscillator tunable over 6.8 THz through degeneracy with a transversely-chirped volume Bragg grating2011In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 105, no 2, p. 239-244Article in journal (Refereed)
    Abstract [en]

    An efficient nanosecond optical parametric oscillator (OPO) with output energies of 0.75 mJ using a periodically poled KTiOPO(4) crystal pumped at 532 nm and generating narrowband output continuously tunable over the range of 6.8 THz, between 1053 nm and 1075 nm, is demonstrated by employing a transversely-chirped volume Bragg grating. The tunable reflectivity spectrum of the chirped volume Bragg grating allowed a smooth transition between singly-resonant and doubly-resonant operation of the OPO without cavity rearrangement. This gave a unique possibility to experimentally verify theoretical predictions regarding the efficiency of type-I and type-0 phase matched degenerate OPOs pumped by multimode Q-switched lasers.

  • 17.
    Thilmann, Nicky
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Jacobsson, Björn
    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.
    Rotari, Eugeniu
    Smirnov, Vadim
    Glebov, Leonid
    Study of a Narrowband Optical Parametric Oscillator at Degeneracy with a Transversely Chirped Bragg Grating2009In: 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum Electronics and Laser Science Conference, CLEO/QELS 2009, IEEE , 2009, p. 1672-1673Conference paper (Refereed)
    Abstract [en]

    We investigate the energy and spectral properties of a narrowband (0.9 nm) optical parametric oscillator, tuneable around the degeneracy point from 1055 to 1066 nm, by usage of a transversely chirped volume Bragg grating.

  • 18.
    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)
  • 19.
    Thilmann, Nicky
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Strömqvist, Gustav
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Pujol, M. C.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, V.
    Diaz, F.
    Nonlinear refractive indices in Yb3+-doped and undoped monoclinic double tungstates KRE(WO4)(2) where RE=Gd, Y, Yb, Lu2009In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 96, no 2-3, p. 385-392Article in journal (Refereed)
    Abstract [en]

    The linear absorption bandgap in the ultraviolet and the nonlinear index n (2) in near infrared were systematically measured in undoped and Yb3+-doped top-seeded solution-grown monoclinic double-tungstate KRE(WO4)(2) (RE=Gd, Y, Yb, Lu) crystals. Anisotropic n (2) nonlinear indices have been determined for EaEuro-N (m) and EaEuro-N (p) polarizations with the maximum nonlinear index n (2) observed for the light polarized EaEuro-N (m). Moreover, the value of the nonlinear response of particular crystals in this family is proportional to the ionic radius of the RE3+ ion.

  • 20.
    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.
    Pujol, Maria-Cinta
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, Valentin
    Diaz, Francesc
    Nonlinear refractive indices in undoped and Yb-doped KT(WO4)(2) T=Y, Yb, Gd, Lu crystals2009In: 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum Electronics and Laser Science Conference, CLEO/QELS 2009, IEEE , 2009, p. 3045-3046Conference paper (Refereed)
    Abstract [en]

    Nonlinear index was investigated in undoped and Yb-doped monoclinic double-tungstates for E parallel to N-m and E parallel to N-p polarized 819 nm light. Anisotropic n(2) with maximum for E parallel to N-m in all investigated compounds is proportional to the rare earth ion polarizability.

  • 21.
    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.
    Pujol, M.C.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, Valentin
    Diaz, F.
    Characterization of Kerr nonlinearities in undoped and Yb-doped KRE(WO4)2 RE=Y, Yb, Gd, Lu Crystals2009Conference paper (Refereed)
  • 22.
    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)
  • 23.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    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.
    Eciency-optimized, 30W continuous-waveOPO employing a variable re ectivity volume Bragg grating2015Conference paper (Refereed)
  • 24.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Thilmann, Nicky
    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.
    Efficiency-optimized, 30 W continuous-wave OPO employing a variable reflectivity volume Bragg grating2014In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2014Conference paper (Refereed)
  • 25.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    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.
    Pump threshold optimization of a continuous-wave optical parametric oscillator using avariable-reflectivity volume Bragg grating2014Conference paper (Refereed)
  • 26.
    Zukauskas, Andrius
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    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.
    5 mm thick periodically poled Rb-doped KTP for high energy optical parametric frequency conversion2011In: Optical Materials Express, ISSN 2159-3930, Vol. 1, no 2, p. 201-206Article in journal (Refereed)
    Abstract [en]

    A 5 mm thick periodically poled bulk Rb-doped KTiOPO4 (KTP) crystal with a period of 38.86 μm was fabricated by electric field poling. Chemical etching and optical evaluation show a high quality of the periodic ferroelectric domain structure through the whole crystal aperture. The fabricated quasi-phase matching (QPM) device was used in an optical parametric oscillator pumped at 1064 nm with 12 ns pulses at 100 Hz repetition rate to generate 60 mJ parametric radiation with a conversion efficiency of 50%.

  • 27.
    Zukauskas, Andrius
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    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.
    5 mm Thick Periodically Poled Rb:KTiOPO4 for High Power Optical Frequency Conversion2011In: Advanced Solid State Photonics 2011, 2011Conference paper (Refereed)
    Abstract [en]

    A periodically poled bulk Rb-doped KTiOPO 4crystal with 5 mm aperture was fabricated at room temperature. The ferroelectric domain structure is shown to be homogeneous across the whole aperture with a deffof 11 pm/V.

  • 28.
    Zukauskas, Andrius
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    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.
    High Fidelity Large Aperture Periodically Poled Rb:KTiOPO(4) for High Energy Frequency Conversion2011Conference paper (Refereed)
    Abstract [en]

    We demonstrate periodic poling of 5 mm thick Rb-doped KTiOPO(4) crystals at room temperature. The ferroelectric domain grating is shown to be uniform and homogeneous across the whole crystal aperture.

  • 29.
    Zukauskas, Andrius
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    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.
    Periodically poled KTiOAsO4 for highly efficient midinfrared optical parametric devices2009In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 95, no 19Article in journal (Refereed)
    Abstract [en]

    We demonstrate high pattern-fidelity periodic poling of KTiOAsO4 at room temperature. The periodically poled crystal shows a d(eff) of 10.1 pm/V and is used in an optical parametric oscillator pumped at 1064 nm to generate parametric radiation at 1538 and 3452 nm with a conversion efficiency of 45%.

  • 30.
    Zukauskas, Andrius
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    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.
    Periodically Poled KTiOAsO4 For Mid-Infrared Light Generation2010In: Advanced Solid-State Photonics 2010, 2010Conference paper (Refereed)
    Abstract [en]

    A periodically poled KTiOAsO4crystal was fabricated at room temperature. The poled crystal shows a deffof 10.1 pm/V and gives a parametric conversion efficiency of 45%.

1 - 30 of 30
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