Abstract

Blue lasers are very useful for applications in fundamental sciences and advanced technologies. Although the frequency doubling with a first-order quasi-phase-matched (QPM) crystal is an effective approach to obtain blue and UV lasers, the crystal should be poled with a short period, which is technically difficult to fabricate compared with a long period. Using a third-order QPM can be an alternative way to generate blue light, in which the poling period is 3 times larger than that in first-order QPM. In this work, we report on the generation of a 402.5 nm laser by using cavity-enhanced second-harmonic generation and a periodically poled KTP (PPKTP) crystal with a poling period of 10.02 µm. About 36.49 mW output power and 15.3% conversion efficiency are achieved in our experiment.

© 2021 Optical Society of America

Generation of 740??mW of blue light by intracavity frequency doubling with a first-order quasi-phase-matched KTiOPO₄ crystal

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First-order type II quasi-phase-matched UV generation in periodically poled KTP

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Efficient third-harmonic generation in partly periodically poled KTiOPO₄ crystal

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Cavity-enhanced frequency doubling from 795nm to 397.5nm ultra-violet coherent radiation with PPKTP crystals in the low pump power regime

Xin Wen, Yashuai Han, Jiandong Bai, Jun He, Yanhua Wang, Baodong Yang, and Junmin Wang
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Generation of 130  mW of 397.5  nm tunable laser via ring-cavity-enhanced frequency doubling

Yashuai Han, Xin Wen, Jiandong Bai, Baodong Yang, Yanhua Wang, Jun He, and Junmin Wang
J. Opt. Soc. Am. B 31(8) 1942-1947 (2014)