Improved fourth harmonic generation in β-BaB2O4 by tight elliptical focusing perpendicular to walk-off plane
| Autor: | Peter F. Moulton, Alex Dergachev, Marilou Cadatal-Raduban, Takahashi Masakuni, Toshihiko Shimizu, Akira Osada, Nobuhiko Sarukura |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
business.industry Dephasing Physics::Optics Nonlinear optics Condensed Matter Physics medicine.disease_cause Laser law.invention Inorganic Chemistry Crystal Optics law Materials Chemistry medicine High harmonic generation Absorption (electromagnetic radiation) business Beam (structure) Ultraviolet |
| Zdroj: | Journal of Crystal Growth. 318:606-609 |
| ISSN: | 0022-0248 |
| Popis: | We present a scheme using beta-barium borate (BBO) crystal to maximize fourth-harmonic ultraviolet (UV) generation from high-power, kHz-range repetition rate Nd lasers by reducing thermal dephasing during the phase matching process. Thermal dephasing due to nonlinear absorption (NLA) induced by two-photon absorption of high peak power fourth-harmonic UV radiation is reduced by minimizing second- and fourth-harmonic beam overlap through tight elliptical focusing perpendicular to the walk-off plane, leading to multi-watt, kHz-range repetition rate UV generation in BBO crystal. With such beam shaping, nearly 5 W at 10 kHz of 262-nm UV radiation is generated using an 8-mm long BBO crystal. The results of our investigation show an efficient way of achieving multi-watt UV generation at kHz-range repetition rate. |
| Databáze: | OpenAIRE |
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