摘要
对Du Fort-Frankel差分格式用于谐振腔模式计算进行简要分析,以该差分格式为基础,提出基于移动矩阵法的非稳腔模式数值计算快速算法.对空腔共焦非稳腔模式进行数值模拟,将计算结果与参考文献进行对比,两者吻合较好.对有源共焦非稳谐振腔内增益区位置对谐振腔输出功率的影响进行数值计算,结果表明:对于采用共焦非稳腔的大功率激光器,当增益体积一定、小信号增益曲线相同时,随着谐振腔内增益区与凹面镜之间的距离的减小,激光器输出功率会有较为明显的提高.数值算例证明了本文方法的正确性和有效性.
Du Fort-Frankel differential format for mode calculation of unstable resonator is presented. A fast finite differential method based on matrix motion and coordinate system transformation is used to calculate output field of a bare cavity and an active cavity. Calculated results are compared with references. It shows that the method is good both in precision and speed in calculating modes of an active unstable resonator with large Fresnel numbers. It can be 20 to 40 times faster compared with a conventional method. With this method, output power of a HF chemical laser is calculated. It shows that the output power increase with decrease of distance between gain medium and concave mirror. This result is valuable to the design of high power DF chemical laser.
出处
《计算物理》
EI
CSCD
北大核心
2012年第4期557-565,共9页
Chinese Journal of Computational Physics
基金
国家高技术发展计划资助项目
关键词
激光技术
激光非稳腔
模式计算
快速差分方法
laser technique
unstable resonator
mode calculation
fast finite differential method
