| 1. |
- Barrett, Laura, et al.
(författare)
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High-contrast coercive field engineering for periodic poling of RbKTiOPO4 with Ba2+/K+ ion-exchange
- 2024
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Ingår i: Optics Express. - : Optica Publishing Group. - 1094-4087. ; 32:8, s. 14252-14260
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Tidskriftsartikel (refereegranskat)abstract
- We investigate a new method of coercive field engineering for periodic poling of RbKTiOPO4 (RKTP). By ion exchanging RKTP in a molten salt containing 7 mol% Ba(NO3)2 and 93 mol% KNO3 we achieve more than an order of magnitude difference in polarization switching time between the exchanged and non-exchanged regions. This method is used to fabricate periodic gratings of 2.92 µm in 1 mm thick bulk RKTP for second harmonic generation at 779 nm with a normalized conversion efficiency of 2%/Wcm. We show that the poled domain structures are stable at 300 °C, and that there is no bulk refractive index modification associated with the periodic ion exchange.
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| 2. |
- Bowers, Mark S., et al.
(författare)
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Feature issue introduction : advanced solid-state lasers
- 2022
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Ingår i: Optics Express. - : Optica Publishing Group. - 1094-4087. ; 30:12, s. 20762-20766
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Tidskriftsartikel (refereegranskat)abstract
- This joint issue of Optics Express and Optical Materials Express features 36 state-of-the art articles written by authors who participated in the international conference advanced solid state lasers held online from October 3-7, 2021. This review provides a summary of these articles covering a wide spectrum of topics around solid-state lasers from materials research to sources and from design innovation to applications.
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| 3. |
- Campbell, S., et al.
(författare)
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Frequency-doubling in femtosecond laser inscribed periodically-poled potassium titanyl phosphate waveguides
- 2007
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Ingår i: Optics Express. - 1094-4087. ; 15:25, s. 17146-17150
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 4. |
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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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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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| 7. |
- Johansson, Sandra, et al.
(författare)
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An all solid-state UV source based on a frequency-quadrupled, passively Q-switched 946 nm laser
- 2007
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Ingår i: Optics Express. - 1094-4087. ; 15:2, s. 449-
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Tidskriftsartikel (refereegranskat)abstract
- We report a 236 nm light source with 20 mW of average power based on critically phase-matched second-harmonic generation in a beta-barium borate crystal at room temperature. The fundamental light source was a passively Q-switched 946 nm Nd: YAG laser tunable from 10-38 kHz and with a pulse length of 16 ns. In the generation of 473 nm light, periodically poled KTP and BiBO was compared in terms of conversion efficiency and stability.
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| 8. |
- Kianirad, Hoda, et al.
(författare)
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Contact poling of Rb:KTiOPO4 using a micro-structured silicon electrode
- 2015
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Ingår i: Optics Express. - 1094-4087. ; 23:2, s. 636-641
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Tidskriftsartikel (refereegranskat)abstract
- A contact poling technique for domain engineering of ferroelectrics using a micro-structured silicon electrode is demonstrated on Rb:KTiOPO4. High quality QPM gratings were reproducibly fabricated. The silicon electrode is reusable and the technique potentially suitable when complex structures with sub-mu m features are to be domain engineered, which otherwise is incompatible with conventional photolithography. A non-negligible domain broadening was seen and attributed to a low nucleation rate using this type of electrode. However, under the appropriate poling conditions, this could be exploited to obtain a QPM grating with a short pitch (2 mu m), equal to half of the electrode period.
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| 9. |
- Kores, Cristine C., et al.
(författare)
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Quasi-phase matched second harmonic generation in periodically poled Rb-doped KTiOPO4 ridge waveguide
- 2018
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Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 26:25, s. 33142-33147
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Tidskriftsartikel (refereegranskat)abstract
- A 10.8 mu m wide ridge waveguide was fabricated by diamond-blade dicing in an ion-exchanged periodically poled Rb-doped KTiOPO4 sample. The waveguide was used to generate blue second harmonic light at 468.8 nm in the TM(00 )mode through first order Type I quasi-phase matching, exploiting the large d(33) coefficient of the crystal. It was evaluated using a cw Ti:Sapphire laser, and 6.7 mu W of blue light was generated with 5.8 mW of fundamental radiation at 933.8 nm coupled through the waveguide. The results presented here pave the way for efficient nonlinear processes in a waveguide format. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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| 10. |
- Lagatsky, A. A., et al.
(författare)
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Efficient Doubling of Femtosecond Pulses in Aperiodically and Periodically Poled KTP Crystals
- 2007
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Ingår i: Optics express. - 1094-4087. ; 15:3, s. 1155-1160
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Tidskriftsartikel (refereegranskat)abstract
- Efficient doubling of femtosecond pulses in periodically and aperiodically poled KTP crystals is demonstrated by employing the quasi-phasematched frequency conversion technique. Conversion efficiencies as high as 60% were achieved using either aperiodically or periodically poled KTP nonlinear crystals in an extracavity, single-pass configuration using a diode-pumped femtosecond Yb:KYW laser as the pump source. The temporal characteristics of the frequency-doubled pulses as a function of focusing conditions in a "thick" nonlinear crystal regime have been investigated experimentally and pulses as short as 177 fs have been generated at around 520 nm under strong focusing conditions using a KTP crystal with aperiodic poling.
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