Single pass 7 watts continuous wave 532 nm generation by focusing optimized second harmonic generation in MgO:PPLN

Jui-Yu Lai; Chen-Shao Hsu; Cheng-Wei Hsu; Dong-Yi Wu; Karin Wu; Ming-Hsien Chou

doi:10.1117/12.2510795

4 March 2019 Single pass 7 watts continuous wave 532 nm generation by focusing optimized second harmonic generation in MgO:PPLN

Jui-Yu Lai, Chen-Shao Hsu, Cheng-Wei Hsu, Dong-Yi Wu, Karin Wu, Ming-Hsien Chou

Author Affiliations +

Proceedings Volume 10902, Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII; 1090205 (2019) https://doi.org/10.1117/12.2510795
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

Thermal effect in high-power CW single-pass 1064 nm SHG for 532 nm generation using MgO:PPLN crystal has been theoretically and experimentally investigated. By careful control of the focusing condition to deal with the well-known thermal issue such as thermal lensing and dephasing in MgO:PPLN crystal, we have successfully generated >7W green output at 532nm using a 25mm long crystal without observing optical damage. This achievement has enhanced the maximum CW green power generated through MgO:PPLN crystal by a factor of 3 as compared to the common optimization under low power condition, and by a factor of 2 as compared to the scheme of single-pass multi-crystal cascading SHG. To our best knowledge, this result gives the highest CW green power via SHG of MgO:PPLN crystal. Furthermore, a systematic study for SHG optimization has shown that >30% SHG conversion efficiency can be achieved from 2W to 7W under output-power dependent optimization.

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Jui-Yu Lai, Chen-Shao Hsu, Cheng-Wei Hsu, Dong-Yi Wu, Karin Wu, and Ming-Hsien Chou "Single pass 7 watts continuous wave 532 nm generation by focusing optimized second harmonic generation in MgO:PPLN", Proc. SPIE 10902, Nonlinear Frequency Generation and Conversion: Materials and Devices XVIII, 1090205 (4 March 2019); https://doi.org/10.1117/12.2510795

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