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Proceedings Paper

70% frequency-doubling efficiency of 0.8-W mode-locked picosecond Ti:sapphire laser with external cavity
Author(s): Tatsuya Ohira; Shingo Maeda; Yuma Takida; Hiroshi Kumagai
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Paper Abstract

The importance of the light source in the UV and VUV region has increased in industrial and scientifical fields. In general, the second harmonic generation of near-infrared coherent light in an external enhancement cavity has been used to obtain high-efficiency and high-power coherent UV lights. However, the pump light of the high average power has been necessary for such high-effective wavelength conversions. We studied high-efficient and simple generation of UV continuous and quasi-continuous waves by optimizing an external cavity and using a BiB3O6 (BiBO) as a nonlinear crystal of relatively high nonlinear optical coefficient. We report the generation of high-efficient 389nm coherent light based on the second harmonic generation of a mode-locked Ti:sapphire picosecond pulses laser with BiBO. As a result, more than 500mW of output at 389nm was obtained with the maximum input of 800mW and a maximum efficiency of 63%. Furthermore, considering the reflective loss of output mirror of 389nm light, we could obtain 70% conversion efficiency. This value was one of the best results of the second harmonic generation of less than 1W of average pump power.

Paper Details

Date Published: 21 February 2011
PDF: 6 pages
Proc. SPIE 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X, 79170A (21 February 2011); doi: 10.1117/12.874565
Show Author Affiliations
Tatsuya Ohira, Osaka City Univ. (Japan)
Shingo Maeda, Osaka City Univ. (Japan)
Yuma Takida, Osaka City Univ. (Japan)
Hiroshi Kumagai, Osaka City Univ. (Japan)

Published in SPIE Proceedings Vol. 7917:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X
Konstantin L. Vodopyanov, Editor(s)

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