高效率LD角侧泵浦Nd∶YAG电光调Q激光器  

High-Efficiency LD Corner-Side-Pumped Nd∶YAG Electro-Optical Q-Switched Laser

作　　者：吕世威 朱占达[1,2,3,4] 刘大鹏 惠勇凌 雷訇[1,2,3,4] 李强 Lv Shiwei;Zhu Zhanda;Liu Dapeng;Hui Yongling;Lei Hong;Li Qiang(Institute of Laser Engineering,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of Laser Technology,Beijing 100124,China;Beijing Higher Institution Engineering Research Center of Advanced Laser Manufacturing,Beijing 100124,China;Key Laboratory of Trans-scale Laser Manufacturing Technology,Ministry of Education,Beijing 100124,China)

机构地区：[1]􀆽1北京工业大学材料与制造学部激光工程研究院,北京100124 [2]北京市激光应用技术工程技术研究中心,北京100124 [3]激光先进制造北京市高等学校工程研究中心,北京100124 [4]跨尺度激光成型制造技术教育部重点实验室,北京100124

出　　处：《中国激光》2022年第17期16-21,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(62075003);北京市自然科学基金、教委科研计划(4202007,KZ202110005010)。

摘　　要：实验设计和研究了一种激光二极管(LD)角侧泵浦Nd∶YAG电光调Q激光器,实现了高效率1064nm脉冲激光输出。以低掺杂Nd∶YAG晶体为增益介质,将Sm∶YAG吸收材料键合在Nd∶YAG晶体四周(非激光方向)用于抑制放大自发辐射(ASE)和寄生振荡,将YAG晶体键合在Sm∶YAG晶体上以构成复合板条激光晶体。采用对称角侧泵浦方式直接抽运,泵浦光在复合板条激光晶体中多次全反射,多次被Nd∶YAG晶体吸收,可用于实现长光程吸收,提高泵浦光吸收效率。在重复频率为5Hz、输入电流为170A的条件下,获得了单脉冲能量为106mJ、脉宽为15ns的激光输出,光光转换效率为30.1%,输出能量动静比高达94.64%。实验结果表明:所设计的复合板条激光晶体结构有效抑制了ASE和寄生振荡,所提方法为1064nm调Q脉冲激光的高效率输出提供了有效途径。Objective Laser diode(LD)-pumped neodymium-doped yttrium aluminum garnet(Nd∶YAG)Q-switched laser has the advantages of small volume,lightweight,long service life,and high conversion efficiency.It is widely used in material processing,lidar,and laser ranging.Recently,the development of laser technology has necessitated an increase in the efficiency and output energy of Nd∶YAG Q-switched laser.Presently,the output optical-to-optical conversion efficiency of LD-pumped Nd∶YAG electro-optical Q-switched laser has been maintained at~20%.Improving the optical-to-optical conversion efficiency of the laser can effectively reduce the volume and weight of the laser under the same energy output conditions.Various approaches to improve the optical-to-optical conversion efficiency have been reported.One way is to enhance the pump energy absorption.Another way is to reduce energy loss by suppressing amplified spontaneous emission(ASE)and parasitic oscillation to enhance the output optical-to-optical conversion efficiency of Q-switched laser.In this study,we propose a high-efficiency LD corner-side-pumped Nd∶YAG electro-optical Q-switched laser using a composite slab laser crystal.By improving the pump light absorption efficiency and suppressing ASE,we improve the output optical-to-optical conversion efficiency of the Nd∶YAG electro-optical Q-switched laser.We hope that our research can be helpful in improving the output energy and efficiency of Q-switched solid-state lasers.Methods This study is based on a composite slab laser crystal.First,the gain medium is a Nd∶YAG crystal with atomic fraction of 0.1%and cross section size of 4 mm×4 mm.Four pieces of Sm:YAG crystals with atomic fraction of 3%and thickness of 1 mm are thermally bonded around the side surfaces of the Nd∶YAG crystal to inhibit ASE and parasitic oscillation.Next,undoped YAG bulk crystals are sequentially bonded to the Sm:YAG crystal.Then,we determin the size of the composite slab laser crystal.Note that using an improved corner-side hybrid pump st

关 键 词：激光器 Nd∶YAG 电光调Q 放大自发辐射 

分 类 号：TN248.1[电子电信—物理电子学]