标题：Cascaded third-harmonic-generation converter based on a single ADP crystal
作者：Qi, Hong-Wei; Sun, Yu-Xiang; Wang, Zheng-Ping; Zhang, Xu-Zhao; Yu, Fa-Peng; Sun, Xun; Xu, Xin-Guang; Zhao, Xian
作者机构：[Qi, Hong-Wei; Sun, Yu-Xiang; Wang, Zheng-Ping; Zhang, Xu-Zhao; Yu, Fa-Peng; Sun, Xun; Xu, Xin-Guang; Zhao, Xian] Shandong Univ, State Key Lab Crystal 更多
通讯作者地址：[Wang, ZP; Xu, XG]Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Shandong, Peoples R China;[Wang, ZP; Xu, XG]Shandong Univ, Minist Educ, Key 更多
来源：CHINESE PHYSICS B
关键词：third-harmonic-generation; ADP crystal; polarization; ultraviolet laser
摘要：Based on a specially designed optical structure, an efficient cascaded third-harmonic-generation (THG) output of a 1064-nm, pico-seconds pulse laser is successively realized by using an NH4H2PO4 (ADP) crystal that acts as the second-harmonic-generation component and sum-frequency-generation component. The maximum THG output is 1.61 mJ, and the highest conversion efficiency from 1064 nm to 355 nm reaches 35%, which are obviously superior to the results obtained using a KDP crystal under the same circumstance. The further phase-matching analysis indicates that this THG configuration of ADP crystal can be applied to various fundamental wavelengths in a range of 1 mu m-1.1 mu m. Compared with the previously reported KDP THG converter, which is based on a similar principle, the present ADP THG converter is favorable for large-energy, high-efficiency operation because of the larger effective nonlinear optical coefficient d(eff) and higher laser damage threshold.