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  • 1. Agate, B.
    et al.
    Rafailov, E. U.
    Sibbett, W.
    Saltiel, S. M.
    Koynov, K.
    Tiihonen, Mikael
    KTH, Tidigare Institutioner, Fysik.
    Wang, Shunhua
    KTH, Tidigare Institutioner, Fysik.
    Laurell, Fredrik
    KTH, Tidigare Institutioner, Fysik.
    Battle, P.
    Fry, T.
    Roberts, T.
    Noonan, E.
    Portable ultrafast blue light sources2004Inngår i: OSA Trends Opt. Photonics Series, 2004, s. 651-652Konferansepaper (Fagfellevurdert)
    Abstract [en]

    An effective means of achieving a portable, ultrafast blue-light source using a variety of nonlinear media is demonstrated. We investigate the relative merits of aperiodically-poled bulk and waveguide nonlinear crystals in comparison to periodically-poled structures.

  • 2. Agate, B.
    et al.
    Rafailov, E. U.
    Sibbett, W.
    Saltiel, S. M.
    Koynov, K.
    Tiihonen, Mikael
    KTH, Tidigare Institutioner, Fysik.
    Wang, Shunhua
    KTH, Tidigare Institutioner, Fysik.
    Laurell, Fredrik
    KTH, Tidigare Institutioner, Fysik.
    Battle, P.
    Fry, T.
    Roberts, T.
    Noonan, E.
    Portable ultrafast blue light sources designed with frequency doubling in KTP and KNbO32004Inngår i: IEEE Journal of Selected Topics in Quantum Electronics, ISSN 1077-260X, E-ISSN 1558-4542, Vol. 10, nr 6, s. 1268-1276Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We demonstrate an effective means of achieving compact, truly portable, and entirely self-contained ultrafast blue light sources. Using a variety of nonlinear media to achieve simple second-harmonic generation of a femtosecond Cr:LiSAF laser, we investigate the relative merits of aperiodically poled bulk and waveguide nonlinear crystals in comparison to periodically poled structures. Such a compact and convenient source of ultrashort laser pulses in the blue spectral region could be of great interest for on-site applications spanning a host of disciplines, such as biomedical imaging, optical micromanipulation, and high-resolution spectroscopy.

  • 3. Arvidsson, G.
    et al.
    Henriksson, P.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Passive polymer waveguides1994Konferansepaper (Fagfellevurdert)
  • 4. Arvidsson, G.
    et al.
    Karlsson, H.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Periodic poling of crystals from the KTP family1997Konferansepaper (Fagfellevurdert)
  • 5. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, Tidigare Institutioner, Fysik.
    Anordning i form av koherent ljuskälla baserad på frekvenskonvertering av ljuset från lasrar: [Controllable laser light source uses two laser sources to enable frequency mixing such that three or four new wavelengths may be generated]1990Patent (Annet (populærvitenskap, debatt, mm))
    Abstract [en]

    The present invention concerns a coherent light source based on frequency conversion of the radiation from two lasers (20, 21) by frequency mixing in optical waveguides (10; 90), which are provided in a substrate (1). The wavelengths for the two lasers (20, 21) should be such, that the phase matching condition for the optically nonlinear frequency conversion is fulfilled in the waveguide structure (10; 90). The frequency conversion is accomplished in the form of frequency mixing, frequency doubling or down conversion in frequency by parametric oscillation so that in total three or four new wavelengths can be generated. By using integrated optics technique the output radiation can be controlled in various ways, for example be switched to different output waveguides, varied in intensity or colour balance.

  • 6. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Quasi-phasematched nonlinear optical interactions inferroelectric crystals1994Konferansepaper (Fagfellevurdert)
  • 7. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Second-harmonic generation in channel waveguidesfabricated by titanium diffusion in magnesium doped lithium niobate1987Konferansepaper (Fagfellevurdert)
  • 8. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Titanium diffused lithium niobate waveguides forwavelength conversion based on nonlinear optical interaction1984Konferansepaper (Fagfellevurdert)
  • 9. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Jaskorzynska, B.
    Webjörn, J.
    Loni, A.
    Keys, R. W.
    De La Rue, R. M.
    Influence of annealing on the conversion efficiency forSHG by Cerenkov radiation from proton-exchanged LiNbO3 waveguides1989Konferansepaper (Fagfellevurdert)
  • 10. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Webjörn, .
    Compact light sources based on frequencyconversion in lithium niobate and other nonlinear optical crystals1993Konferansepaper (Fagfellevurdert)
  • 11. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, Tidigare Institutioner, Fysik.
    Webjörn, J.
    Vågledare samt förfarande för framställning av sådan: [Quasi-phase-matched optical waveguides and method of making same]1988Patent (Annet (populærvitenskap, debatt, mm))
    Abstract [en]

    A waveguide (and a method for fabrication of a waveguide) for electromagnetic waves, arranged in an optically non-linear crystal substrate (1), such as LiNbO3, LiTaO3 or KTiOPO4, whereby a periodically domain-inverted structure, with periodically reversed ferroelectric polarity, is provided in a channel waveguide (6), having a higher refractive index than other parts of the substrate. The regions of reversed ferroelectric polarity are achieved by means of a heat treatment yielding a domain-inversion governed by a periodic perturbation in the crystal surface, obtained by use of a periodic mask structure on the crystal surface. The periodic structure is arranged in such a way that it constitutes a quasi-phase-matching structure. Thereby the waveguide is capable of converting light or radiation of a certain wavelength (certain wavelengths) to light or radiation of another predetermined wavelength (other predetermined wavelengths) with high efficiency.

  • 12. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Webjörn, J.
    Åhlfeldt, H.
    Methods to fabricate periodically domain-invertedstructures in ferroelectric crystals1994Konferansepaper (Fagfellevurdert)
  • 13. Arvidsson, G.
    et al.
    Sjöberg, A.
    Lipovsky, A. A.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Titanium-diffused  waveguides in magnesium-dopedlithium niobate for nonlinear frequency conversion1989Konferansepaper (Fagfellevurdert)
  • 14. Arvidsson, M.
    et al.
    Hansson, B.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Lindström, C.
    Olsson, M.
    A pulse stabilized micro-chip laser1996Konferansepaper (Fagfellevurdert)
  • 15. Baxter, G. W.
    et al.
    Schlup, P.
    McKinnie, I. T.
    Hellstrom, J.
    Laurell, Fredrik
    KTH, Tidigare Institutioner, Fysik.
    Single-mode near-infrared optical parametric oscillator amplifier based on periodically poled KTiOPO42001Inngår i: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 40, nr 36, s. 6659-6662Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A singly resonant, single-axial-mode, optical parametric oscillator (OPO) based on periodically poled KTiOPO4 (PPKTP) is reported. Signal (1.68 mum) and idler (2.90 mum) optical bandwidths have been narrowed to < 400 MHz by use of a diffraction grating at grazing incidence. The OPO generates 370 muJ of signal radiation when pumped by 3.1 mJ of 1.064-mum radiation. We implemented a single-pass PPKTP amplifier to yield 2.15-mJ signal and 1.17-mJ idler radiation without broadening the spectral bandwidths.

  • 16. Bertani, Stefano
    et al.
    Jacobsson, Bjorn
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Stjernström, Mårten
    KTH, Skolan för kemivetenskap (CHE), Kemi, Analytisk kemi (stängd 20110630).
    Stretching-tunable external-cavity laser locked by an elastic silicone grating2006Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 14, nr 25, s. 11982-11986Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 17. Bierlein, J. D.
    et al.
    Bindloss, W.
    Laurell, Fredrik
    Lee, J. D.
    Segmented waveguides having selected Bragg reflection characteristics1991Patent (Annet (populærvitenskap, debatt, mm))
    Abstract [en]

    Segmented waveguides for wavelength conversion (e.g., waveguides comprising alternating sections of crystalline substrate having the formula K1-x Rbx TiOMO4 where x is from 0 to 1 and M is P or As and sections of substrate material in which cations of said substrate have been partially replaced) and devices and processes employing segmented waveguides for wavelength conversion are disclosed wherein a periodic structure along the waveguide provides a Bragg reflection having a wavelength essentially equal to the wavelength of the input wave used for wavelength conversion. Also disclosed is a process for preparing a channel waveguide for a wavelength conversion system wherein areas along a portion of a crystal substrate surface used for forming the desired channel are alternately masked and unmasked during cation replacement by immersion in a molten salt.

  • 18.
    Bjurshagen, Stefan
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Koch, R.
    Acreo AB, Kista.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Quasi-three-level Nd:YAG laser under diode pumping directly into the emitting level2006Inngår i: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 261, nr 1, s. 109-113Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We present theoretical and experimental investigations on ground-state direct pumping at 869 nm into the emitting level F-4(3/2) of end-pumped quasi-three-level Nd:YAG lasers operating at 946 nm. We have demonstrated, what we believe is for the first time, a Nd:YAG laser at 946 nm directly pumped by diodes and obtained 1.6 W of output power.

  • 19.
    Bjurshagen, Stefan
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Koch, R
    Hoffman, H J
    946-nm Nd: YAG laser under ground-state direct diode-pumping at 869 nm2005Inngår i: 2005 Conference on Lasers & Electro-Optics (CLEO), Vols 1-3, WASHINGTON, DC: OPTICAL SOC AMERICA , 2005, s. 328-330Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We have demonstrated, what we believe is for the first time, direct diode-pumping at 869 rim into the emitting level of a quasi-three-level Nd:YAG laser operating at 946 nm.

  • 20.
    Bjurshagen, Stefan
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Koch, R.
    Hoffman, H. J.
    946-nm Nd:YAG laser under direct diode-pumping at 869 nm2005Inngår i: Conference on Lasers and Electro-Optics Europe - Technical Digest, 2005Konferansepaper (Fagfellevurdert)
  • 21. Bode, M.
    et al.
    Freitag, I.
    Spiekermann, S.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Ultra-violet single frequency pulses with high averagepower using frequency converted passively Q-switched quasi-monolithic Nd:YAGring lasers2001Konferansepaper (Fagfellevurdert)
  • 22. Boudrioua, A.
    et al.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Moretti, P.
    Loulerque, C.
    Depth dependence of the second harmonic generationof ion implanted waveguides2000Konferansepaper (Fagfellevurdert)
  • 23. Boudrioua, A.
    et al.
    Loulergue, J. C.
    Laurell, Fredrik
    KTH, Tidigare Institutioner, Fysik.
    Moretti, P.
    Nonlinear optical properties of (H+,He+)-implanted planar waveguides in z-cut lithium niobate: annealing effect2001Inngår i: Journal of the Optical Society of America. B, Optical physics, ISSN 0740-3224, E-ISSN 1520-8540, Vol. 18, nr 12, s. 1832-1840Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Reflection second-harmonic generation from the polished waveguide end face was used to investigate the nonlinear properties of LiNbO3-implanted waveguides fabricated by use of 2-MeV He+ and 1.5-Mev H+ beams. Results were compared with waveguides obtained by protonic exchange in benzoic acid, In contrast to the exchanged sample where the nonlinearity is strongly reduced, the implanted samples showed that the guiding region presents rather the same response as the substrate. The area where the optical barrier is located showed a strongly enhanced second-harmonic signal that was likely to be due to structural modifications in this area. Moreover, the investigation of the annealing effect showed strong interaction of protons with the lattice compared with that of He+ ions.

  • 24. Brydegaard, M.
    et al.
    Larsson, J.
    Török, S.
    Malmqvist, E.
    Zhao, G.
    Jansson, S.
    Andersson, M.
    Svanberg, S.
    Åkesson, S.
    Laurell, Frederik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Bood, J.
    Short-Wave infrared atmospheric scheimpflug lidar2018Inngår i: EPJ Web of Conferences, EDP Sciences, 2018, Vol. 176, artikkel-id 01012Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Atmospheric dual-band Scheimpflug lidar is demonstrated at 980 and 1550 nm. Signals are compared during three weather conditions, and the spatio-temporal resolution of the atmospheric structure is considered. The potential for aerosol classification is evaluated, and future directions are discussed.

  • 25. Budriunas, R.
    et al.
    Kucˇinskas, D.
    Stanislauskas, T.
    Gadonas, D.
    Viotti, Anne-Lise
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Zukauskas, Andrius
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Varanavicˇius, A.
    Broadband noncollinear optical parametric amplification in GaSe pumped at 1.5μm2018Inngår i: Optics InfoBase Conference Papers, OSA - The Optical Society , 2018Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We demonstrate broadband parametric amplification in GaSe crystal in noncollinear geometry. Seed pulses spanning 1.5-2.6μm are produced by cascaded χ(2) nonlinearity in a periodically poled Rb:KTP crystal. Amplified pulse bandwidths supporting 10-15fs transformlimited pulse durations at ~2μm central wavelength are achieved.

  • 26. Campbell, S.
    et al.
    Thomson, R. R.
    Hand, D. P.
    Kar, A. K.
    Reid, D. T.
    Canalias, Carlota
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Frequency doubling in femtosecond-written periodically-poled potassium titanyl phosphate waveguides2007Inngår i: Lasers and Electro-Optics, 2007 European Conference on and the International Quantum Electronics Conference, 2007, s. 4386106-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The second-harmonic conversion efficiency within the PPKTP waveguide is investigated using two separate tunable CW Ti:sapphire lasers at 800 nm and 980 nm. Results show strong conversion efficiency which imply that the local damage-induced index modification does not adversely affect the periodic domain structure in the material.

  • 27. Campbell, S.
    et al.
    Thomson, R. R.
    Hand, D. P.
    Kar, A. K.
    Reid, D. T.
    Canalias, Carlota
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Frequency doubling in femtosecond-written periodically-poled potassium titanyl phosphate waveguides2007Inngår i: Conference on Lasers and Electro-Optics, 2007, CLEO 2007, 2007, s. 4452462-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Frequency doubling is demonstrated in femtosecond-laser-created single-mode waveguides written in a periodically-poled potassium titanyl phosphate crystal. Conversion efficiencies of 0.22%/W (0.02%/W) were obtained for first (third) order phasematching at 980nm (800nm).

  • 28. Campbell, S.
    et al.
    Thomson, R. R.
    Hand, D. P.
    Kar, A. K.
    Reid, D. T.
    Canalias, Carlota
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Frequency-doubling in femtosecond laser inscribed periodically-poled potassium titanyl phosphate waveguides2007Inngår i: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 15, nr 25, s. 17146-17150Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 29.
    Canalias, Carlota Canalias
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Zukauskas, Andrius
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Tjörnhamman, Staffan
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Viotti, Anne-Lise
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Liljestrand, Charlotte
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Highly efficient periodically poled KTP-isomorphs with large apertures and extreme domain aspect-ratios2018Inngår i: Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, SPIE - International Society for Optical Engineering, 2018, Vol. 10516, artikkel-id 105160WKonferansepaper (Fagfellevurdert)
    Abstract [en]

    Since the early 1990's, a substantial effort has been devoted to the development of quasi-phased-matched (QPM) nonlinear devices, not only in ferroelectric oxides like LiNbO3, LiTaO3 and KTiOPO4 (KTP), but also in semiconductors as GaAs, and GaP. The technology to implement QPM structures in ferroelectric oxides has by now matured enough to satisfy the most basic frequency-conversion schemes without substantial modification of the poling procedures. Here, we present a qualitative leap in periodic poling techniques that allows us to demonstrate devices and frequency conversion schemes that were deemed unfeasible just a few years ago. Thanks to our short-pulse poling and coercive-field engineering techniques, we are able to demonstrate large aperture (5 mm) periodically poled Rb-doped KTP devices with a highly-uniform conversion efficiency over the whole aperture. These devices allow parametric conversion with energies larger than 60 mJ. Moreover, by employing our coercive-field engineering technique we fabricate highlyefficient sub-μm periodically poled devices, with periodicities as short as 500 nm, uniform over 1 mm-Thick crystals, which allow us to realize mirrorless optical parametric oscillators with counter-propagating signal and idler waves. These novel devices present unique spectral and tuning properties, superior to those of conventional OPOs. Furthermore, our techniques are compatible with KTA, a KTP isomorph with extended transparency in the mid-IR range. We demonstrate that our highly-efficient PPKTA is superior both for mid-IR and for green light generation-as a result of improved transmission properties in the visible range. Our KTP-isomorph poling techniques leading to highly-efficient QPM devices will be presented. Their optical performance and attractive damage thresholds will be discussed.

  • 30.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Fragemann, A.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Ferroelectric domain imaging on the nonpolar facesof periodically poled KTiOPO42003Konferansepaper (Fagfellevurdert)
  • 31.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Hirohashi, Junji
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Polarization switching characteristics of flux grown KTiOPO4 and RbTiOPO4 at room temperature2005Inngår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 97, nr 12, s. 124105-Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 32.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Nordlöf, Mats
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    A KTiOPO4 nonlinear photonic crystal for blue second harmonic generation2009Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 94, nr 8Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 33.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Nordlöf, Mats
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Two-Dimensional Nonlinear Photonic Crystal in KTiOPO4 for CW Second Harmonic Blue Light Generation2007Inngår i: 2007 CONFERENCE ON LASERS & ELECTRO-OPTICS/QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2007), NEW YORK: IEEE , 2007, s. 404-405Konferansepaper (Fagfellevurdert)
    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.

  • 34.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Clemens, R.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Sub-micronperiodically poled flux grown KTiOPO4 for optical applications2003Konferansepaper (Fagfellevurdert)
  • 35.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Clemens, R.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Sub-micronperiodically poled flux-grown KTiOPO4 for optical applications2003Konferansepaper (Fagfellevurdert)
  • 36.
    Canalias, Carlota
    et al.
    KTH, Tidigare Institutioner, Fysik.
    Pasiskevicius, Valdas
    KTH, Tidigare Institutioner, Fysik.
    Clemens, Rosalie
    KTH, Tidigare Institutioner, Fysik.
    Laurell, Fredrik
    KTH, Tidigare Institutioner, Fysik.
    Submicron periodically poled flux-grown KTiOPO42003Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 82, nr 24, s. 4233-4235Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 37.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Fokine, Michael
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Backward quasi phase matched second harmonic generation in sub-micron periodically poled KTiOPO42006Inngår i: CLEO/QELS 2006, Optical Society of America, 2006Konferansepaper (Fagfellevurdert)
    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.

  • 38.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Fokine, Michael
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Backward quasi phase matched second harmonic generation in sub-micron periodically poled KTiOPO42005Inngår i: 2005 Conference on Lasers & Electro-Optics (CLEO), Vols 1-3, WASHINGTON: OPTICAL SOC AMERICA , 2005, s. 2264-2266Konferansepaper (Fagfellevurdert)
    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.

  • 39.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Fokine, Michael
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Backward quasi-phase-matched second-harmonic generation in submicrometer periodically poled flux-grown KTiOPO42005Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 86, nr 18, s. 181105-1-181105-3Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 40.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Fokine, Michael
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Progress in Sub-Micrometer Periodicity of Quasi-Phase Matching Structures2009Inngår i: 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum Electronics and Laser Science Conference, CLEO/QELS 2009, IEEE , 2009, s. 906-907Konferansepaper (Fagfellevurdert)
    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.

  • 41.
    Canalias, Carlota
    et al.
    KTH, Tidigare Institutioner, Fysik.
    Pasiskevicius, Valdas
    KTH, Tidigare Institutioner, Fysik.
    Fragemann, Anna
    KTH, Tidigare Institutioner, Fysik.
    Laurell, Fredrik
    KTH, Tidigare Institutioner, Fysik.
    High-resolution domain imaging on the nonpolar y-face of periodically poled KTiOPO4 by means of atomic force microscopy2003Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 83, nr 4, s. 734-736Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 42.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Advances in KTP-Family Materials2007Konferansepaper (Fagfellevurdert)
  • 43.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Periodic poling of KTiOPO4: From micrometer to sub-micrometer domain gratings2006Inngår i: Ferroelectrics (Print), ISSN 0015-0193, E-ISSN 1563-5112, Vol. 340, nr 1, s. 27-47Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 44.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Periodical domains gratings go nano2009Konferansepaper (Fagfellevurdert)
  • 45.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Sub-µmperiodically poled KTiOPO42009Konferansepaper (Fagfellevurdert)
  • 46.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    Grilli, Simonetta
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik.
    De Natale, P.
    Ferraro, P.
    In situ visualization of domain kinetics in flux grown KTiOPO4 by digital holography2007Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 102, nr 6, s. 064105-Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 47.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Nordlöf, M.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Domain engineering in KTiOPO4: from periodic poling to self-assembled2007Konferansepaper (Fagfellevurdert)
  • 48.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Wang, Shunhua
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Nucleation and growth of periodic domains during electric field poling in flux-grown KTiOPO4 observed by atomic force microscopy2006Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 88, nr 3, s. 032905-1-032905-3Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 49.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Zukauskas, Andrius
    Liljestrand, Charlotte
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Advances in QPM Devices Based on KTP Isomorphs2013Konferansepaper (Fagfellevurdert)
  • 50.
    Canalias, Carlota
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Zukauskas, Andrius
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Liljestrand, Charlotte
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Pasiskevicius, Valdas
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Laurell, Fredrik
    KTH, Skolan för teknikvetenskap (SCI), Tillämpad fysik, Laserfysik.
    Sub-wavelength domain engineering in KTP isomorphs: QPM devices with counter-propagating photons2013Inngår i: 2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), New York: IEEE , 2013, s. 6600156-Konferansepaper (Fagfellevurdert)
    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.

1234567 1 - 50 of 669
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