双侧面90°抽运微通道致冷Yb:YAG板条激光器

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。

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

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 75% and the pump intensity could be reached as high as 1.9 kW/cm2 on the surface and 38 kW/cm3 in the bulk that is more higher than the threshold of 1.7 kW/cm3. The maximum output pulse energy of 25.5 mJ with slope efficiency of 13% was obtained from a plano-concave cavity with an output coupling of 6%. Once an acousto-optic modulator (AOM) was inserted into the cavity, Q-switched pulse with energy of 4.7 mJ and pulse width of 24.8 ns were achieved.