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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。
The Yb: YAG slab lasers with a 90 ° arrangement on both sides of a laser diode array (LDA) with a lenticular lens are reported. The laser crystal used in this experiment is 6 mm × 10 mm × 1 mm in size. The number of heteroatoms is 3%. Pumping light is pumped to a spot size of 10 mm × 1 mm through a self-designed condenser system. The efficiency of the condenser system is 75%, and the power density of the crystal surface reaches 1.9 kW / cm 2. The body power density reached 38 kW / cm3, well above the threshold of 1.7 kW / cm3. When the laser adopts a flat-cavity structure and the output of the laser is 6%, the laser single pulse output energy is up to 25.5 mJ and the slope efficiency is 13%. After the insertion of acousto-optic Q-switched crystal, 4.7 mJ Q-switched pulse output was obtained with a pulse width of 24.8 ns.