| 1. |
- Canalias, Carlota, et al.
(författare)
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Mirrorless optical parametric oscillators
- 2010
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Ingår i: Nonlinear Photonics (NP) 2010. - Washington, D.C. : OSA. - 9781557528964
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Konferensbidrag (refereegranskat)abstract
- We present the experimental implementation of a mirrorless optical parametric oscillator based on sub-μm periodically poled KTiOPO4. The poling process for sub-μm gratings and the unique properties of the device will be discussed.
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| 2. |
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| 3. |
- García-Cortés, Alberto, et al.
(författare)
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Z-scan measurements of nonlinear refractive indices of NaT(XO4)2 T= Y, La, Gd, Lu and Bi, X= Mo, W, femtosecond laser crystals
- 2008
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Ingår i: SOLID STATE LASERS AND AMPLIFIERS III. - USA : SPIE - International Society for Optical Engineering. ; , s. 69981N-
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Konferensbidrag (refereegranskat)abstract
- The characterization of the coefficient of the nonlinear optical Kerr effect, the nonlinear refractive index (n(2)), of several femtosecond laser crystals with compositions derived by total or partial replacement of D(2+) in DXO(4), X = Mo or W, is presented. Tetragonal (space group I4) Na-based double tungstates NaT(WO(4))(2) (T = Y, La, Gd, Lu and Bi) and double molybdate NaY(MoO(4))(2), as well as the monoclinic (space group C2/c) Li(3)Gd(3)Ba(2)(MoO(4))(8) crystals, have been measured by the z-scan technique. All these crystals present structural local disorder, and among them the tetragonal ones exhibit significant n(2) values, which should allow their efficient laser pulsed operation by Kerr-lens mode locking, especially NaBi(WO(4))(2), 68x10(-16) cm(2)/W (for sigma light), which is about twice than for the others. This feature is attributed to the high polarizability associated to the lone electron pair of Bi(3+).
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| 4. |
- Henriksson, Markus, et al.
(författare)
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Tandem PPKTP and ZGP OPO for mid-infrared generation
- 2008
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Ingår i: Proceedings of SPIE, the International Society for Optical Engineering. - USA : SPIE - International Society for Optical Engineering. - 0277-786X .- 1996-756X. ; 7115, s. 71150O1-10
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Tidskriftsartikel (refereegranskat)abstract
- Efficient laser sources in the 3-5 μrn wavelength range are needed for directed infrared countermeasures, but also have applications in remote-sensing, medicine and spectroscopy. We present new results on our tandem optical parametric oscillator (OPO) scheme for converting the radiation from a 1.06 μm Nd3+-laser to the mid-infrared. Multi Watt level output power in the 3-5 μm range at 20 kHz pulse repetition frequency is reported. Our setup uses a type I quasi phasematched PPKTP crystal in a near degenerate OPO to generate 2.13 μm radiation. A volume Bragg grating resonant close to, but not exactly at the degenerate wavelength, is used as a cavity mirror to reduce the bandwidth and ensure singly resonant operation. Both signal and idler from the PPKTP OPO are used to pump a ZGP OPO generating high power radiation in the 3-5μm region. Using this scheme for each pump photon it is possible to generate four photons for each pump photon, all in the interesting wavelength range, thus enabling high efficiency conversion.
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| 5. |
- Jang, Hoon, et al.
(författare)
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Control of forward stimulated polariton scattering in periodically-poled KTP crystals
- 2013
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Ingår i: Optics Express. - 1094-4087. ; 21:22, s. 27277-27283
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Tidskriftsartikel (refereegranskat)abstract
- We report suppression of forward stimulated polariton scattering (SPS) in chi((2)) structured media. Periodic poling in KTiOPO4 (KTP) leads to the destructive interference of phonon-polariton waves, which is responsible for the dependence of the SPS threshold on the poling period. This was confirmed by comparing the SPS thresholds in periodically-poled KTP (PPKTP) crystals with different poling periods. Further confirming the physical picture, we studied the changes in the Stokes power distribution as a function of the rotation angle of the PPKTP crystal.
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| 6. |
- Jang, Hoon, et al.
(författare)
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Control of forward stimulated polariton scattering in periodically poled nonlinear crystals
- 2012
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Ingår i: 2012 Conference on Lasers and Electro-Optics, CLEO 2012. - Washington, D.C. : IEEE. - 9781467318396 ; , s. 6325627-
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Konferensbidrag (refereegranskat)abstract
- Periodic poling in KTP leads to periodic phase reversal of the polaritons generated in Cherenkov phase-matched direction. This is responsible for the dependence of stimulated Raman scattering threshold on crystal rotation angle and poling period.
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| 7. |
- Jang, Hoon, et al.
(författare)
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Counter-propagating parametric interaction with phonon-polaritons in periodically poled KTiOPO4
- 2017
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Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 25:3, s. 2677-2686
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Tidskriftsartikel (refereegranskat)abstract
- Strongly enhanced backward stimulated polariton scattering (BSPS) is demonstrated in periodically-poled KTiOPO4 (KTP) crystals with a high power-conversion efficiency up to 70%. We study the physical mechanism of such counter-propagating parametric interaction with phonon-polaritons in χ(2) modulated structures. BSPS is a three-wave mixing that is distinguished from backward stimulated Raman scattering (BSRS), while a strong absorption at large polariton wave-vectors can still make BSPS display certain characteristics of BSRS such as self-compression of the Stokes pulse. We also compare BSPS with counter-propagating parametric oscillation in the near- and mid-infrared range, providing an estimation of the fabrication error margin to expect the outcome of their competition in the same device.
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| 8. |
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| 9. |
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| 10. |
- Masiello, Fabio, et al.
(författare)
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Investigation by coherent X-ray section topography of ferroelectric domain behaviour as a function of temperature in periodically poled Rb:KTP
- 2011
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Ingår i: Journal of applied crystallography. - 0021-8898 .- 1600-5767. ; 44, s. 462-466
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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