标题：Thermal effect investigation and passively Q-switched laser performance of composite Nd:YVO4 crystals
作者：Li, Shixia; Li, Yufei; Zhao, Shengzhi; Li, Guiqiu; Wang, Xiaomei; Yang, Kejian; Li, Dechun; Li, Tao
作者机构：[Li, Guiqiu] Shandong Univ, Sch Informat Sci & Engn, Jinan 250100, Peoples R China.; Shandong Univ, Shandong Prov Key Lab Laser Technol & Applicat, 更多
通讯作者地址：[Li, GQ]Shandong Univ, Sch Informat Sci & Engn, Jinan 250100, Peoples R China.
来源：OPTICS AND LASER TECHNOLOGY
关键词：Composite crystal; Passively Q-switched; Thermal effect
摘要：Diode-pumped continuous-wave (CW) and passively Q-switched composite Nd:YVO4 lasers are presented by using Cr4+:YAG as saturable absorber. The temperature distributions and thermal focal lengths in three Nd:YVO4 crystals are numerically analyzed by a finite element method and the results show that diffusion-bonding composite crystals can effectively reduce the thermal lens effect. CW and passively Q-switched laser performances are experimentally investigated. The maximum CW output power of 335 W with an optical slope efficiency of 54.6% was obtained by Nd(0.1 aft):YVO4/Nd(0.5 aft):YVO4/Nd(1.0 at%):YVO4 composite crystal under an incident pump power of 6.52 W. The largest single pulse energy of 4.4 mu J with a pulse duration of 22 ns at a 166 kHz pulse repetition rate was also achieved. (C) 2014 Elsevier Ltd. All rights reserved.