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  • 101.
    Lindgren, Gustav
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kalinin, Sergei V.
    Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA..
    Vasudevan, Rama K.
    Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA..
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Polarization-dependent local conductivity and activation energy in KTiOPO42019In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 114, no 19, article id 192901Article in journal (Refereed)
    Abstract [en]

    We study the local conductivity properties of KTiOPO4 using conductive atomic force microscopy in ultrahigh vacuum (UHV). We show that domains with opposite orientations have different conductivity values. We investigate the temperature dependence of the local conductivity and report a difference in the activation energy of 25% between different domains. Furthermore, we show that the local conductivity increases with the number of biased-scans. Finally, it is found that the domain wall conductivity previously observed at ambient conditions vanishes in UHV. Our results are discussed in terms of the screening effects and surface conditions.

  • 102.
    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, article id 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.

  • 103.
    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.

  • 104.
    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, p. CW3B.2-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.

  • 105.
    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, p. 20332-20339Article 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.

  • 106. Lu, D.
    et al.
    Peña, A.
    Segonds, P.
    Debray, J.
    Joly, S.
    Zukauskas, Andrius
    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.
    Yu, H.
    Zhang, H.
    Wang, J.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Boulanger, B.
    Validation of the angular quasi-phase-matching theory for the biaxial optical class using PPRKTP2018In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 43, no 17, p. 4276-4279Article in journal (Refereed)
    Abstract [en]

    We report the first experimental validation of angular quasi-phase-matching (AQPM) theory in a biaxial crystal by performing second-harmonic generation (SHG) in the periodically-poled Rb-doped KTiOPO4 (PPRKTP) crystal cut as a sphere. Both AQPM and birefringence phase-matching (BPM) angles were measured thanks to a Kappa circle. 

  • 107. Lu, D.
    et al.
    Peña, A.
    Segonds, P.
    Debray, J.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. KTH, School of Engineering Sciences (SCI), Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Physics. KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. KTH, School of Engineering Sciences (SCI), Physics.
    Boulanger, B.
    Angular quasi-phase-matching in a sphere of PPRKTP2018In: Optics InfoBase Conference Papers, Optical Society of America, 2018Conference paper (Refereed)
    Abstract [en]

    we report the first measurements of angular quasi-phase-matching directions of secondharmonic generation performed in the periodically-poled Rb-doped KTiOPO4 biaxial crystal cut as a sphere.

  • 108.
    Maglione, Mario
    et al.
    University of Bordeaux.
    Theerthan, Anand
    University of Bordeaux.
    Rodriguez, Vincent
    University of Bordeaux.
    Peña, Alexandra
    university of Grenoble Alpes.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Ménaert, Bertrand
    university of Grenoble Alpes.
    Boulanger, Benoît
    university of Grenoble Alpes.
    Intrinsic ionic screening of the ferroelectric polarization of KTP revealed by second-harmonic generation microscopy2016In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 6, no 1, p. 137-145Article in journal (Refereed)
    Abstract [en]

    Mobile charges and lattice polarization interact in ferroelectric materials because of the Coulomb interaction between the mobile free charges and the fixed lattice dipoles. Using SHG microscopy, we have investigated this mutual screening in KTiOPO4, a ferroelectric/superionic single crystal in which the mobile charges are K$+$ ions. The ionic accumulation close to the crystal surfaces leads to orders of magnitude increase of SHG. This ionic space charge model is supported by the absence of such an effect in non-ionic conductor but ferroelectric BaTiO3, by its temperature dependence in KTiOPO4 and by its broad depletion at domain walls.

  • 109. 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, p. 462-466Article 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.

  • 110.
    Mutter, Patrick
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kores, Cristine C.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kianirad, Hoda
    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.
    Recent Progress in RKTP waveguides2019Conference paper (Refereed)
  • 111.
    Mølster, Kjell Martin
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Hugo
    Division of Atomic Physics at the Faculty of Engineering (LTH), Lund University.
    Sørgård, Trygve
    Department of Physics, Norwegian University of Science and Technology, Trondheim.
    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.
    Österberg, Ulf L.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    THz time-domain reflection spectroscopy of KTiOPO42019Conference paper (Refereed)
    Abstract [en]

    There is an ongoing development of THz sources for high-field applications, especially with the view of potential for THz-driven particle accelerators. For such sources nonlinear materials with high optical damage threshold and low loss are required. KTiOPO4, (KTP) is a well-established material for nonlinear optical applications in the visible and near-IR region thanks to its large transparency, high nonlinear coefficient and damage threshold. Its reasonably low absorption [1, 2] and strong coupling to phonon-polariton degree of freedom [1]. This shows promise for efficient IR to THz conversionprocess. Indeed,Wu et al.[2] recently demonstrated its superiority to LiNbO3and LiTaO3in a back to back experiment. In view of this, it is important to determinethe spectrum of complex refractive index over larger spectral range and with higher accuracy than has been do so far. KTP is an orthorhombic crystal belonging to mm2 point group with a rather complex vibrational mode structure containing 192 degrees of freedom. Earlier spectroscopic studies of KTP have either lacked the possibility of directly extracting the complex refractive index [3] or been limited by absorption of the transmitted signal due to the strong resonances of KTP, limiting the spectral extenttoabout 2.5 THz [4]. In this work we utilize reflection THz time-domain spectroscopy (TTDS) to determine the spectrum of the refractive index, n, and the absorption coefficient, , between 0.5 THz and up to 7 THz for two eigenpolarizations on the (001) plane.

  • 112.
    Mølster, Kjell Martin
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Hugo
    Division of Atomic Physics at the Faculty of Engineering (LTH), Lund University.
    Sørgård, Trygve
    Department of Physics, Norwegian University of Science and Technology, Trondheim.
    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.
    Österberg, Ulf L.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    THz Time-Domain Reflection Spectroscopy of KTiOPO42019In: 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, Optical Society of America, 2019, article id cc_p_19Conference paper (Refereed)
    Abstract [en]

    Terahertz (THz) radiation has been of increasing interest in the last decades, for security, manufacturing, quality control, medical and security imaging applications. The field requires more efficient and affordable sources and nonlinear upconversion schemes point in this direction. KTiOPO, (KTP) is a well-established material for nonlinear optical applications in the visible and near-IR region thanks to its large transparency, high nonlinear coefficient and damage threshold. Its reasonably low absorption [1, 2] and strong polariton resonances [1] show promise for efficient IR to THz upconversion and Wu et al. [2] recently demonstrated its superiority to LiNbO3 and LiTaO3 in a back to back experiment. However, the complex refractive index needs to be measured before further power scaling is realistic.

  • 113.
    Mølster, Kjell Martin
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Sørgård, Trygve
    Department of Physics, Norwegian University of Science and Technology.
    Laurell, Hugo
    Division of Atomic Physics at the Faculty of Engineering (LTH), Lund University.
    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.
    Österberg, Ulf L.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Time-domain spectroscopy of KTiOPO4 in the frequency range 0.6–7.0 THz2019In: OSA Continuum, E-ISSN 2578-7519, Vol. 2, no 12, p. 3521-3538Article in journal (Refereed)
    Abstract [en]

    We report on THz time-domain spectroscopy measurements of flux grown KTiOPO4 in the frequency range 0.6–7.0 THz (20 to 240 cm−1). Our results compare well with earlier Raman and far-infrared measurements. We theorize that the differences between the optical phonon mode resonances reported in the literature are due to what growth parameters and melt compositions are used to grow the crystals. We also report on a new feature at 1.4 THz (47 cm−1).

  • 114. Müller, S.
    et al.
    Calmano, T.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kränkel, C.
    Huber, G.
    Frequency doubling in fs-laser written waveguides in periodically poled KTiOPO42014Conference paper (Refereed)
  • 115.
    Müller, Sebastian
    et al.
    Universität Hamburg.
    Calmano, Thomas
    Universität Hamburg.
    Metz, Philip W.
    Universität Hamburg.
    Kränkel, Christian
    Universität Hamburg.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Liljestrand, Charlotte
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Huber, Günter
    Universität Hamburg.
    Highly efficient continuous wave blue second-harmonic generation in fs-laser written periodically poled Rb:KTiOPO4 waveguides2014In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 39, no 5, p. 1274-1277Article in journal (Refereed)
    Abstract [en]

    Waveguides were inscribed into a 9.5 mm long periodically poled KTiOPO4 crystal with a Ti:sapphire femtosecond-laser. Waveguiding was achieved between two parallel written tracks with spacings of 17–19 μm. The fundamental power of 1.6 W for frequency doubling in the waveguide was delivered by a continuous wave Ti:sapphire laser at a wavelength of 943.18 nm. A maximum output power of 76 mW in the blue spectral region was achieved. This corresponds to a single pass normalized conversion efficiency of 4.6%  W−1 cm−2.

  • 116. Nishi, R.
    et al.
    Yoshioka, T.
    Hong Pham, M.
    Takatori, S.
    Nakazato, T.
    Shimizu, T.
    Sarukura, N.
    Estacio, E.
    Sasaki, T.
    Nishizaw, J.
    Krayushkin, S. V.
    Kawamura, K.
    Suruga, Sh.
    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.
    Design Principle of a Quasi Noncritical Phase-Matched Difference Frequency Generator in the THz Region using a Periodically-Poled KTP Crystal2011Conference paper (Refereed)
  • 117.
    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.
    Nonlinear optical devices with nanostructured ferroelectrics [invited]2009Conference paper (Refereed)
  • 118.
    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.
    Nonlinear optical devices with nanostructured ferroelectrics [invited]2009Conference paper (Refereed)
  • 119.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Gallo, Katia
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Advances in frequency converters with structured ferroelectrics2011Conference paper (Refereed)
  • 120.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Gallo, Katia
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Advances in quasi phase-matched optical frequency converters2011In: 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011, Istanbul, Turkey: IEEE Communications Society, 2011, p. 6050605-Conference paper (Refereed)
    Abstract [en]

    Recent advances in the growth of ferroelectric crystals with low optical losses and good structural consistency in particular KTiOPO4 and stoichiomethic Mg:LiTaO3 allowed a vast extension of applicability of quasi-phase-matched frequency converters. In this paper we overview recent advances in structuring these materials enabling high-energy pulse generation, extremely broadband parametric gain, and some unique applications in the quasi phase-matched crystals containing submicron-periodicity 1D structures as well as in 2D-structured crystals.

  • 121.
    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.
    Gallo, Katia
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Advances in quasi-phase matched parametric devices2011Conference paper (Refereed)
  • 122.
    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.
    Advances in structuring technology and applications of nonlinear materials from KTiOPO4family2008Conference paper (Refereed)
  • 123.
    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.
    Domain Structured KTP: Advances in Technology, Characterization and Applications2007Conference paper (Refereed)
    Abstract [en]

    Current state of poling technology in KTiOPO4allows submicrometer QPM periodicities and novel applications. A promising application in broadband infrared parametric amplifiers is reviewed. Photochromic damage in KTP and other nonlinear crystals will be discussed

  • 124.
    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.
    Efficient and broadband picosecond stimulated Raman scattering in KTiOPO42006In: Advanced solid-state photonics 2006, Optical Society of America, 2006Conference paper (Refereed)
    Abstract [en]

    Picosecond SRS with single-pass efficiency exceeding 50% and 34 THz bandwidth was observed in KTiOPO4. At peak intensities above 10 GW/cm2 the SRS character changes from narrowband to broadband showing substantial "softening" of polariton modes.

  • 125.
    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.
    Highly efficient stimulated Raman scattering of picosecond pulses in KTiOPO42006In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 88, no 4Article in journal (Refereed)
    Abstract [en]

    High-efficiency picosecond stimulated Raman scattering (SRS) by phonon-polaritons has been observed in KTiOPO4 in a single pass through a 10 mm long crystal. For pulses longer than 10 ps, the SRS waves formed a symmetric pattern consisting of four distinct beams: SRS Stokes and anti-Stokes wavelengths originating both from the near-infrared pump and from the scattering of the second harmonic of the pump. At peak intensities above 10 GW/cm(2) and pulse length of 1.5 ps, the SRS character changes into what can be called runaway Raman scattering with efficiencies exceeding 50% and Raman gain spreading over 60 THz.

  • 126.
    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.
    Nonlinear frequency converters with nanostructured ferroelectrics2012In: Technical Digest - 2012 17th Opto-Electronics and Communications Conference, OECC 2012, IEEE , 2012, p. 572-573Conference paper (Refereed)
    Abstract [en]

    Progress in structuring ferroelectric nonlinear materials with sub-micrometer periodicity domains for counter-propagating nonlinear interactions is overviewed. As an example of device realisation, the unique coherence properties of counter-propagating parametric interaction in such structures are dicussed.

  • 127.
    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)
  • 128.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Strömqvist, Gustav
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Mirrorless OPO: first steps towards unlocking the potential of counter-propagating three-wave interactions2008In: Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications VII / [ed] Powers, PE, 2008, Vol. 6875, p. 87508-87508Conference paper (Refereed)
    Abstract [en]

    In this work we present the development of the sub-micron ferroelectric domain structuring technology in KTiOPO4. We used these structures to demonstrate second-order interactions involving counter-propagating waves. Of special interest is the mirrorless optical parametric oscillator, where distributed feedback between the counter-propagating signal and idler waves obviates the need for mirrors, surface coatings or precise cavity alignment. Mirrorless optical parametric oscillator also demonstrates some unique and useful spectral properties. These experimental demonstrations are but first steps towards a number of tantalizing applications which, however, require even smaller ferroelectric domain periodicities and further work on the material structuring technology.

  • 129.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Jang, Hoon
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Control of phonon-polariton waves in ferroelectric structures [invited]2013Conference paper (Refereed)
  • 130.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Jang, Hoon
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    High-efficiency backward stimulated polariton scattering in periodically poled ferroelectrics [invited]2015Conference paper (Refereed)
  • 131.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Strömqvist, Gustav
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Counter-Propagating Nonlinear Interactions in Sub-Micrometer-Structured Ferroelectrics2009Conference paper (Refereed)
    Abstract [en]

    We discuss spectral characteristics, tuning, noncollinear operation and temporal dynamics in mirrorless optical parametric oscillator with periodically poled KTiOPO4. The crystal structuring technology on sub-micrometer scale will be presented.

  • 132.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Strömqvist, Gustav
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Noncollinear Mirrorless Optical Parametric Oscillator2008In: 2008 Conference On Lasers And Electro-Optics & Quantum Electronics And Laser Science Conference: Vols 1-9, 2008, p. 1800-1801Conference paper (Refereed)
    Abstract [en]

    The first demonstration of self-established noncollinear operation in the idler-counter-propagating mirrorless optical parametric oscillator is presented using periodically poled KTiOPO(4) having 800 nm period. The noncollinear geometry is employed for enhanced output wavelength tuning.

  • 133.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Strömqvist, Gustav
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Nonlinear optical devices with submicron-periodicity QPM structures2008Conference paper (Refereed)
  • 134.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Strömqvist, Gustav
    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.
    Nonlinear devices with submicrometer-periodicity quasi-phase-matched structures2008Conference paper (Refereed)
  • 135.
    Pasiskevicius, Valdas
    et al.
    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.
    Quasi-phase matched nonlinear media: Progress towards nonlinear optical engineering2012In: Optical materials (Amsterdam), ISSN 0925-3467, E-ISSN 1873-1252, Vol. 34, no 3, p. 513-523Article, review/survey (Refereed)
    Abstract [en]

    Nonlinear optics has been enabled by the invention of the laser 50 years ago, and since then both technologies evolved together complementing and enabling each other. In this paper we attempt to briefly overview the historic development of second-order nonlinear materials and try to discern the trends which might dominate developments in the future. The advent of methods of quasi-phase matching and added degrees of freedom in managing three-wave mixing processes pushed the field of nonlinear optics into the realm of engineering. This trend, we believe will continue in the future. In this text we give a short description of design principles of one-dimensional and two-dimensional quasi-phase matched structures and emphasize the increased functionality afforded by such structures. We also overview the nonlinear media where engineering of nonlinear interactions has been demonstrated with the primary focus on ferroelectric and semiconductor nonlinear crystals.

  • 136.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tiihonen, Mikael
    Fragemann, A.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Broadband optical parametric amplification innear- and mid-infrared spectral region with periodically-structured KTiOPO4isomorphs2005Conference paper (Refereed)
  • 137.
    Pasiskevicius, Valdas
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tiihonen, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Jacobsson, Björn
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Henriksson, Markus
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Hirohashi, Junji
    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.
    Optical parametric oscillators and amplifiers with periodically poled ferroelectrics2006In: 2nd EPS-QEOD EUROPHOTON CONFERENCE, European Physical Society , 2006Conference paper (Refereed)
  • 138. Pelton, M.
    et al.
    Marsden, P.
    Ljunggren, D.
    Tengner, M.
    Karlsson, A.
    Fragemann, A.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Brightsource of polarization-entangled photons using periodically poled potassiumtitanyl phosphate2003Conference paper (Refereed)
  • 139.
    Pelton, Matthew
    et al.
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Marsden, Philip
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Ljunggren, Daniel
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Tengner, Maria
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Karlsson, Anders
    KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
    Fragemann, Anna
    KTH, Superseded Departments, Physics.
    Canalias, Carlota
    KTH, Superseded Departments, Physics.
    Laurell, Fredrik
    KTH, Superseded Departments, Physics.
    Bright, single-spatial-mode source of frequency non-degenerate, polarization-entangled photon pairs using periodically poled KTP2004In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 12, no 15, p. 3573-3580Article in journal (Refereed)
    Abstract [en]

    We use two perpendicular crystals of periodically-poled KTP to directly generate polarization-entangled photon pairs, the majority of which are emitted into a single Gaussian spatial mode. The signal and idler photons have wavelengths of 810 nm and 1550 nm, respectively, and the photon-pair generation rate is 1.2 x 10(7) sec(-1) for a pump power of 62 mW. The apparatus is compact, flexible, and easily to use.

  • 140. Pena, A.
    et al.
    Menaert, B.
    Boulanger, B.
    Laurell, Fredrik
    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.
    Ortega, L.
    Segonds, P.
    Debray, J.
    Felix, C.
    Bulk PPKTP by crystal growth from high temperature solution2012In: Journal of Crystal Growth, ISSN 0022-0248, E-ISSN 1873-5002, Vol. 360, p. 52-55Article in journal (Refereed)
    Abstract [en]

    Periodically-poled ferroelectric crystals show unprecedented efficiency and properties otherwise impossible to obtain. Unfortunately, the sample thickness obtainable today limits their use to low and moderate power application. With the aim of increasing the size of periodically domain-structured crystals with a controlled and regular grating period, we proposed an epitaxial growth process using seeds made of thin plates domain engineered by electric field poling. We demonstrated this process with the ferroelectric crystal KTiOPO4 (KTP) which is one of the most promising candidate materials for that purpose. The poling step requires a sample exhibiting (001) and (00 (1) over bar) faces, so that the growth step has to be performed onto these faces. This constraint is a difficulty to circumvent as these faces are not present in the standard equilibrium morphology. It is then necessary to find the growth conditions enabling to work below the roughening temperature of these faces. By using a high temperature solution method, the so-called "flux method", and by choosing an appropriate chemical composition of the flux solution, we obtained periodically domain-structured KTP layers with thicknesses up to 800 mu m and regular periodicity onto (001) and (00 (1) over bar) faces of the initial PPKTP seeds.

  • 141. Pena, Alexandra
    et al.
    Menaert, Bertrand
    Debray, Jerome
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. KTH, School of Engineering Sciences (SCI), Physics.
    Boulanger, Benoit
    Stability of the polar faces in KTiOPO4 crystalline layers grown by liquid phase epitaxy2018In: CrystEngComm, ISSN 1466-8033, E-ISSN 1466-8033, Vol. 20, no 46, p. 7502-7506Article in journal (Refereed)
    Abstract [en]

    The polar faces, (001) and (001), of the ferroelectric KTiOPO4 crystal are not equivalent by symmetry. The stability and the growth rate of both faces have been determined by growing thick crystalline layers by liquid phase epitaxy onto oriented crystalline commercial KTiOPO4 slabs. Growth solutions with different molar compositions in the system KTiOPO4-KPO3-KF and different supersaturation degrees end up with the same result. Whereas the (00 (1) over bar) faces are stable under all the experimental conditions used, the (001) ones are not stable and turn into (00 (1) over bar) faces. Head-to-head domains oriented along the [010] axis at vertical bar 7 +/- 1 degrees vertical bar to the [001] axis propagate from the (001) surface of the seed to the as-grown crystalline layers. The final epitaxies obtained by this process show two (00 (1) over bar) polar end faces; so a twin-crystal along the c direction was grown.

  • 142.
    Peña, Alexandra
    et al.
    Néel.
    Menaert, Bertrand
    Néel.
    Boulanger, Benoit
    Néel.
    Laurell, Fredrik
    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.
    Segonds, Patricia
    Néel.
    Felix, Corinne
    Néel.
    Debray, Jérôme
    Néel.
    Pairis, Sébastien
    Néel.
    Template-growth of periodically domain-structured KTiOPO(4) [Invited]2011In: Optical Materials Express, ISSN 2159-3930, Vol. 1, no 2, p. 185-191Article in journal (Refereed)
    Abstract [en]

    We performed the first growth, from a high temperature solution, of a 38.86 mu m-periodicity PPKTP crystal of good optical quality over a thickness of more than 800 mu m onto each of the two faces perpendicular to the c direction of a PPKTP substrate previously obtained by electric field poling. The quasi-phase matched second harmonic generation properties in the grown layer and substrate are similar and in accordance with calculation.

  • 143. Peña Revellez, A.
    et al.
    Ménaert, B.
    Boulanger, B.
    Segonds, P.
    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.
    Debray, J.
    Félix, C.
    Towards the growth of large size Periodically Poled KTiOPO4 crystals2010Conference paper (Refereed)
  • 144. Revellez, A. P.
    et al.
    Ménaert, B.
    Boulanger, B.
    Laurell, Fredrick
    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.
    Segonds, P.
    Debray, J.
    Félix, C.
    Bulk PPKTP by crystal growth2011Conference paper (Refereed)
    Abstract [en]

    We performed the first growth of a 39.86 μm-periodicity PPKTP crystal of good optical quality over a thickness of 800 μm onto a (001) face of a PPKTP substrate previously obtained by electric field poling.

  • 145. Samanta, G. K.
    et al.
    Kumar, S. Chaitanya
    Mathew, M.
    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.
    High-power, continuous-wave, second-harmonic generation at 532 nm in periodically poled KTiOPO42008In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 33, no 24, p. 2955-2957Article in journal (Refereed)
    Abstract [en]

    We report efficient generation of high-power, cw, single-frequency radiation in the green in a simple, compact configuration based on single-pass, second-harmonic generation of a cw ytterbium fiber laser at 1064 nm in periodically poled KTiOPO4. Using a crystal containing a 17 mm single grating with period of 9.01 mu m, we generate 6.2 W of cw radiation at 532 nm for a fundamental power of 29.75 W at a single-pass conversion efficiency of 20.8%. Over the. entire range of pump powers, the generated green output is single frequency with a linewidth of 8.5 MHz and has a TEM00 spatial profile with M-2 < 1.34. The demonstrated green power can be further improved by proper thermal management of crystal heating effects at higher pump powers and also by optimized design of the grating period to include thermal issues.

  • 146.
    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.
    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.
    Tunable, passively Q-switched single-longitudinal-mode Nd:YVO4 laser using a chirped volume Bragg grating2012In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 109, no 1, p. 99-103Article in journal (Refereed)
    Abstract [en]

    A Nd:YVO4 laser was locked with a chirped volume Bragg grating to achieve single-longitudinal-mode output. Tuning was performed from 1,063 to 1,065 nm by translating the grating and a maximum output power of 4 W was obtained. With a Cr 4+:YAG saturable absorber, Q-switched pulses with 4 ns and a pulse energy of 5.7 lJ were achieved which could be frequency doubled in PPKTP with a conversion efficiency exceeding 50 %.

  • 147.
    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, p. 161-166Article 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.

  • 148. 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.

  • 149.
    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.

  • 150.
    Strömqvist, Gustav
    et al.
    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 interactions in nanostructured ferroelectrics2009Conference paper (Refereed)
12345 101 - 150 of 219
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