激光谐振腔光场及远场分布的数值模拟系统

利用数值迭代法和有限元法，对激光圆形镜球面谐振腔的光场分布及远场光束进行数值求解。采用Matlab编写了具备图形化用户界面(GUI)的功能全面的激光谐振腔模拟系统，系统可以选择和设置谐振腔类型及谐振腔参数等。系统运行后给出谐振腔内光场达到稳定状态时的渡越次数、腔镜上光场振幅和相位分布以及远场光强分布的三维图像。对输出镜反射率均匀分布以及输出镜反射率沿径向逐渐降低的激光谐振腔模式及远场光强分布进行模拟并做了对比分析，结果表明，输出镜反射率变化的激光谐振腔模式形成较快，远场光强分布更集中。

Numerical simulation system of the optical field and the far field distribution of a laser resonator

The optical field distributions in a spherical laser resonator and its far field beam have been numerically studied by means of the numerical iterative method and the finite element method.A full-featured simulation system with a graphical user interface(GUI) in Matlab is presented for some typical laser resonators,and when the type and parameters of resonators are chosen in this system,the iteration times for the optical field to become stable,and 3-D images of the amplitude,the phase distribution of the optical field on the output mirror and its far field intensity distribution can be obtained.A comparison of the modes and the far field intensity distributions for two spherical laser resonators with constant reflectivity and linear gradient reflectivity on the output mirror has been made in the simulation system,and the results show: the modes in the spherical laser resonator with linear gradient reflectivity on the output mirror are formed faster,and the far field light intensity distribution is more concentrated.