title: High-efficiency 355 nm generation in barium aluminum borate diflouride (BaAlBO3F2).
abstract: We demonstrate high-efficiency ultraviolet (UV) laser generation in a nonlinear optical crystal BaAlBO3F2 (BABF); 355 nm UV light was generated by using a type I BABF crystal as a sum-frequency mixing of the fundamental light and the second harmonic from a picosecond Nd:YAG laser operated at a repetition rate of 10 Hz with a pulse duration of 20 ps. An output of 0.635 mJ for the third harmonic was obtained. The conversion efficiency was 26.4%. As far as we know, it was the first time that third-harmonic generation in BABF was achieved. Obviously, the BABF crystal is a promising UV nonlinear optical material because of its relatively large nonlinear coefficient and nonhygroscopicity.
authors.affiliation: Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China. yung_zhou@yeah.net
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhou
authors.forename: Guiling
authors.initials: G
authors.lastname: Wang
authors.forename: Yinchao
authors.initials: Y
authors.lastname: Yue
authors.forename: Chengming
authors.initials: C
authors.lastname: Li
authors.forename: Yuanfu
authors.initials: Y
authors.lastname: Lu
authors.forename: Dafu
authors.initials: D
authors.lastname: Cui
authors.forename: Zhanggui
authors.initials: Z
authors.lastname: Hu
authors.forename: Zuyan
authors.initials: Z
authors.lastname: Xu