大尺寸Tm∶YAP复合激光晶体的生长与性能研究  

Growth and Properties of Large Size Tm∶YAP Composite Laser Crystal

作　　者：李兴旺 韩剑锋 芦佳 邢晓文 王永国 魏磊 徐学珍 LI Xingwang;HAN Jianfeng;LU Jia;XING Xiaowen;WANG Yongguo;WEI Lei;XU Xuezhen(Beijing Opto-Electronics Technology Co.,Ltd.,Beijing 100015,China;Science and Technology on Solid-State Lasers Laboratory,Beijing 100015,China)

机构地区：[1]北京雷生强式科技有限责任公司,北京100015 [2]固体激光技术重点实验室,北京100015

出　　处：《人工晶体学报》2023年第7期1236-1242,共7页Journal of Synthetic Crystals

基　　金：国家重点研发计划(2022YFB3605700)。

摘　　要：采用感应加热提拉法,通过改进热场、更换原料、二次熔接生长,直接生长出了直径大于40 mm的Tm∶YAP/YAP复合晶体毛坯。复合晶坯等径部分YAP段长21 mm,Tm∶YAP段长44 mm,晶坯外观完整,具有良好的光学均匀性和均匀的应力分布。绿光激光和He-Ne激光照射下,晶坯复合界面无散射、无气泡。复合界面两侧干涉条纹基本连续,透过波前差异小。从复合晶坯上加工出了直径5 mm、总长30 mm、端头不掺杂YAP晶体长4 mm的单端Tm∶YAP复合晶体元件,其光学质量优异。在1940 nm固体激光器上采用激光二极管单端泵浦进行了激光性能测试,在泵浦注入功率为117.7 W条件下实现了42.8 W激光输出,输出功率、转换效率和光斑质量均优于非复合激光晶体。Tm∶YAP/YAP composite laser crystal boule with diameter more than 40 mm is directly grown by induction heating Czochralski method through improving the thermal field,changing raw materials,and secondary welding growth.The boule shows no visible cracks,good optical homogeneity and uniform residual stress.For the cylinder part of the boule,the length of the YAP segment is 21 mm,and the length of the Tm∶YAP segment is 44 mm.Under the irradiation of green laser and He-Ne laser,there is no any scatters and bubbles observed at the composite interface.The interference fringes on both sides of the composite interface are basically continuous,and the wavefront difference of transmission is very small.Two composite Tm∶YAP/YAP crystal rods with size of∅5 mm×30 mm each and YAP segment without doping at the end of 4 mm long were prepared from the boule.Both rods show excellent optical quality.The laser performances of the rods were tested on 1940 nm solid-state laser.By single end pump of laser diode,the laser output of 42.8 W is achieved when the input pump power is 117.7 W.Compared with the non-composite laser crystal,the composite Tm∶YAP/YAP crystal shows higher output power,higher conversion efficiency and better beam quality.

关 键 词：掺铥铝酸钇 复合激光晶体 直接生长 提拉法 干涉条纹 激光 

分 类 号：O782.5[理学—晶体学] TN248.1[电子电信—物理电子学]