标题：High power Nd:YAG ceramic lasers: Passive Q-switching and frequency doubling
作者：Lana, Ruijun ;Fedosejevs, Robert ;Liu, Hong ;Wang, Zhengping ;Lv, Yaohui ;Sang, Yuanhua ;Yu, Haohai ;Wang, Jiyang
作者机构：[Lana, Ruijun ;Liu, Hong ;Wang, Zhengping ;Lv, Yaohui ;Sang, Yuanhua ;Yu, Haohai ;Wang, Jiyang ] State Key Laboratory of Crystal Materials, Institute 更多
会议名称：Photonics North 2009
会议日期：24 May 2009 through 27 May 2009
来源：Proceedings of SPIE - The International Society for Optical Engineering
关键词：All-solid-state green laser; Ceramic laser; Cr4+:YAG; KTP frequency doubling; Nd:YAG ceramic; Passively Q-switched
摘要：A high power passive Q-switched laser and a continuous-wave (CW) green laser both with a neodymium-doped yttrium aluminum garnet (Nd:YAG) ceramic as the laser material are investigated, using a CW laser-diode (LD) as pumping source for both experiments. First, with Cr4+:YAG as a saturable absorber, a passively Q-switched ceramic laser has been developed. At a pump power of 15.0 W, Q-switched output with pulse duration of 4.5 ns and pulse energy of 209 μJ has been obtained, corresponding to a peak power of 46.8 kW. The frequency-doubled output of the Nd:YAG ceramic laser was also studied. At a pump power of 21.6 W, CW output of 11.3 W was obtained at 1064 nm, corresponding to an optical conversion efficiency of 52.3%. By using a type-II cut KTP crystal, a maximum output of 1.86 W at 532 nm green has been obtained. The one-dimensional intensity distribution of the cross-section of the second harmonic laser beam was observed to be Gaussian. When the output power was 1 W, the M2 factor was measured to be 1.7. © 2009 SPIE.