Fourth-harmonic generation of a Nd:YAG laser has been achieved with a conversion efficiency of 30.6% in a KBe<sub>2</sub>BO<sub>3</sub>F<sub>2</sub> crystal of thickness 1.8 mm. The acceptance angle at wavelength 532 nm has also been measured.
© 2003 Optical Society of America
Guiling Wang, Chengqian Zhang, Chuangtian Chen, Aiyun Yao, Jie Zhang, Zuyan Xu, and Jiyang Wang, "High-efficiency 266-nm Output of a KBe2BO3F2 Crystal," Appl. Opt. 42, 4331-4334 (2003)