We have demonstrated the second harmonic of a frequency-tripled Nd:YVO<sub>4</sub> laser with 2.5-mW quasi-cw output by using an optically contacted, prism-coupled KBe<sub>2</sub>BO<sub>3</sub>F<sub>2</sub> crystal. We also achieved the second harmonic with a frequency-doubled single-mode Ti:sapphire laser at 172.5 nm and sum-frequency mixing with a dual-wavelength Ti:sapphire laser at 163.3 nm. These wavelengths are to our knowledge the shortest obtained by use of nonlinear crystals for second-harmonic generation and sum-frequency mixing, respectively.
© 2003 Optical Society of America
(140.3610) Lasers and laser optics : Lasers, ultraviolet
(160.4330) Materials : Nonlinear optical materials
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4400) Nonlinear optics : Nonlinear optics, materials
Tadashi Togashi, Teruto Kanai, Taro Sekikawa, Shuntaro Watanabe, Chuangtian Chen, Chengqian Zhang, Zuyan Xu, and Jiyang Wang, "Generation of vacuum-ultraviolet light by an optically contacted, prism-coupled KBe2BO3F2 crystal," Opt. Lett. 28, 254-256 (2003)