为了分析角部抽运方式在中小功率激光器设计中的可行性,基于光线追迹法,计算了不同的激光介质几何结构参量和不同的二极管温度条件下角部抽运复合板条激光器的抽运效率和抽运均匀性。从模拟计算结果可知,只要选择合理的激光介质结构参量,角抽运方式能得到高的抽运效率和较好的抽运均匀性。设计了一种角部抽运Nd:YAG复合板条激光器,在45W的抽运功率下获得了12W的激光输出,光光转换效率约为26.7％,在40W抽运时光束质量Mx2=1.47,My2=1.36。理论分析和实验设计表明,角抽运方式在小功率激光器设计中是可行的。

In order to analyze the feasibility of corner-pumped method in medium and small power lasers design,ray-tracing algorithm was used to simulate the pumping efficiency and absorbed energy distribution of diode corner-pumped lasers for different laser medium parameters and different diode temperatures.It is concluded that high pumping efficiency and good pump uniformity can be obtained for corner-pumped composite slab lasers with appropriate choice of laser medium parameters.A diode corner-pumped composite Nd:YAG slab laser was designed,whose output power was up to 12W under the pump power 45W at optical-optical efficiency of about 26.7%,and whose M2 factors of beam quality at width and thickness direction were 1.47 and 1.36 respectively at 40W pumping energy.Theoretic analysis and experimental design show that corner-pumped method is useful in medium and small power lasers design.