title: Multi-reflected enhancement of fourth harmonic DUV laser generation at 266 nm.
abstract: The stable compact operation in the deep ultraviolet laser at 266 nm is reported from a diode-end-pumped acoustic-optic Q-switched Nd:YVO4/KTP/BBO laser. Fourth harmonic is generated by employing multiple reflections of 532 nm light for taking full advantage of the green beam. An ultraviolet laser at 266 nm with average power of 388.5 mW is obtained with a repetition-rate of 20 kHz, a pulse width of about 59.80 ns, and the corresponding optical to optical conversion efficiency of 11.9% from green to UV. High conversion efficiency and a circular spot of 266 nm laser beam have been achieved in an unfocused beam arrangement.
authors.affiliation: Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
authors.forename: Fengjiang
authors.initials: F
authors.lastname: Zhuang
authors.forename: Ning
authors.initials: N
authors.lastname: Ye
authors.forename: Chenghui
authors.initials: C
authors.lastname: Huang
authors.forename: Haiyong
authors.initials: H
authors.lastname: Zhu
authors.forename: Yong
authors.initials: Y
authors.lastname: Wei
authors.forename: Zhenqiang
authors.initials: Z
authors.lastname: Chen
authors.forename: Hongwei
authors.initials: H
authors.lastname: Wang
authors.forename: Ge
authors.initials: G
authors.lastname: Zhang