2020•Laser Physics LettersRequires access
12.6 W single-frequency continuous-wave 671 nm laser with an external second harmonic generation cavity
Xuchao Liu, Zhimin Wang, Yixuan Zhang, Zihan Zhou, Fengfeng Zhang, Qianqian Liu, Yichen Xu, Yue Song, Ruinan Yang, Nan Zong, Yong Bo, Qinjun Peng, Dafu Cui, Zuyan Xu
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Abstract
Abstract We present a high-power single-frequency continuous-wave (CW) 671 nm laser by the second-harmonic generation (SHG) of a 1342 nm laser based on an external bow-tie enhancement cavity. Different from previous works, and using periodically poled nonlinear crystals for the SHG, we adopt the high damage-threshold nonlinear crystal lithium triborate (LBO) in the external SHG cavity to achieve a high-power CW SHG. In our experiment, with a type-II noncritically phase-matched LBO, an up to 12.6 W CW 671 nm laser is obtained with a 24 W incident 1342 nm laser, corresponding to an SHG conversion efficiency of 52.5 %. To our knowledge, this is a new record of power for the single-frequency CW 671 nm laser.