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Stable operation of 4 mW nanoseconds radiation at 1773 nm by Second Harmonic Generation in KBe_2BO_3F_2 Crystals

2009; Optica Publishing Group; Volume: 17; Issue: 22 Linguagem: Inglês

10.1364/oe.17.020021

1094-4087

Zhimin Wang, Jingyuan Zhang, Feng Yang, Xiankun Cheng, Yong Zhou, Jialin Xu, Yiting Xu, Yong Bo, Qinjun Peng, Dafu Cui, Zuyan Xu, Xiaoyang Wang, Yong Zhu, Chuangtian Chen,

Photorefractive and Nonlinear Optics

We report the generation of nanoseconds radiation at 177.3 nm with a maximum average power of 34.7 mW by second harmonic generation (SHG) in a 2.06-mm thick KBe(2)BO(3)F(2) (KBBF) crystal pumped with a homemade 4.2 W nanoseconds Nd: YAG laser at 355 nm operating at 10 KHz and 49 ns, which corresponds to an energy efficiency of approximately 0.826%. To our knowledge, it is the highest power generated at 177.3 nm. The dependence of phase matching angle of KBBF on temperature is presented for the first time. We also present the details on the measures for stable operation of a 4 mW nanosecond output at 177.3 nm with a lower pumping power in a thinner 1.37-mm KBBF crystal, and the stable output power is improved by about 20 times compared with previous results.