4.81 W Yb:YAG/1 030 nm薄片激光器优化设计

Optimization of 4.81 W Yb:YAG/1 030 nm thin disc laser

摘要: 设计了四程泵浦的Yb:YAG薄片激光器。晶体掺杂原子数分数为10%，几何尺寸为直径10 mm、厚340 μm，提出了Cr/Au金属化方案，采用铟焊工艺将其焊接到微通道水冷热沉上。耦合系统为四程泵浦结构，球面镜规格为直径30 mm、曲率半径50 mm。利用LightTools软件模拟计算了泵浦光斑半径，选用曲率半径200 mm输出镜以使泵浦光斑半径与基模光斑半径比符合模式匹配原则。在激光二极管阵列泵浦功率为18.73 W 时,获得了最高功率为4.81 W的1 030 nm连续激光输出,光-光转换效率为25.7%。

Abstract: The laser diode array (LDA) pumped Yb:YAG thin disc laser has been analysed and optimized. The Yb:YAG disc with 10 mm diameter and 340 μm thickness was employed. The Yb3+ atom fraction is 10%. It was mounted onto the micro-channel copper heat sink by Cr/Au/In. The four-pass optical coupling system was well designed with two spherical imaging mirrors which have a diameter of 30 mm and radius of curvature of 50 mm. The pump-beam radius was calculated by LightTools Software. Considering mode matching, the output mirror which has radius of curvature 200 mm was employed. When the incident power was 18.73 W, a CW output power of 4.81 W at 1 030 nm was obtained. The optical conversion efficiency was 25.7%.