双侧面90°抽运微通道致冷Yb:YAG板条激光器  

Laser-Diode Side-Pumped Yb∶YAG Slab Laser with Microchannels Heat Sink

作　　者：李劲东[1] 李小莉[1] 陆雨田[1] 朱小磊[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,上海201800

出　　处：《中国激光》2006年第3期289-292,共4页Chinese Journal of Lasers

基　　金：中国科学院创新前沿课题(X030506)资助项目

摘　　要：报道了采用带有微柱镜的激光二极管阵列(LDA)双侧面90°排布抽运的Yb∶YAG板条激光器,实验中使用的激光晶体尺寸为6 mm×10 mm×1 mm,掺杂原子数分数为3%。抽运光通过自行设计的聚光系统聚焦成10 mm×1 mm的光斑进行抽运,聚光系统的效率为75%,晶体表面功率密度达到1.9 kW/cm2,晶体内抽运光交叠区的体功率密度达到38 kW/cm3,远高于阈值的1.7 kW/cm3。当激光器采用平-凹腔结构,耦合输出为6%时激光单脉冲输出能量最高为25.5 mJ,斜率效率为13%。插入声光调Q晶体后获得4.7 mJ的调Q脉冲输出,脉宽为24.8 ns。A laser diode array （LDA） with the micro lens two-side-pumped Yb：YAG slab laser was reported, the Yb：YAG slab was in size of 6 mm×10 mm×1 mm, and the doping concentration was 3 at.-%. A novel structure was designed to focus the pump beam to as small as 10 mm × 1 mm in size. The transmission efficiency of the structure is about 750/00 and the pump intensity could be reached as high as 1.9 kW/cm^2 on the surface and 38 kW/ cm^3 in the bulk that is more higher than the threshold of 1.7 kW/cm^3. The maximum output pulse energy of 25.5 mJ with slope efficiency of 13 % was obtained from a piano-concave cavity with an output coupling of 6 ~. Once an acousto-optic modulator （AOM） was inserted into the cavity, Qswitched pulse with energy of 4.7 mJ and pulse width of 24.8 ns were achieved.

关 键 词：激光技术 固体激光器 激光二极管阵列 侧面抽运 Yb:YAG板条 

分 类 号：TN248.1[电子电信—物理电子学]