双侧对称抽运横流液体激光器的光束质量分析

为了提高横流液体激光器的光束质量,采用ANAYS软件分析了双侧抽运液体激光器的液体介质的温度分布,对不同流速条件下的非稳腔光场分布和光束质量M~2因子进行了数值计算。结果表明,存在一个使光束质量M~2因子较优的液体流速,并针对该类激光系统中增益和折射率梯度分布都关于抽运方向对称分布的特点,采用柱透镜补偿波前畸变效应,将光束质量因子由24降低到12.5,说明柱透镜补偿位相畸变能有效地提高液体输出光束质量。

Theoretical analysis of the beam quality of two-side-pumped symmetrically transverse flow liquid lasers

In order to improve the beam quality of a two-side-pumped symmetrically transverse flow continuous liquid laser, the output beam quality M2 factor and light intensity distribution at different flow velocities were simulated on the condition of the liquid laser pumped symmetrically with two sides diode lasers,the heat distribution in the liquid medium was analyzed by means of ANSYS software.Simulation results show that is an optimum flow velocity for best beam quality.For both the gain and refractive index in the laser system distribute symmetrically with the pumping direction,after compensation for the wavefront error with cylindrical lenses,the M2 factor was decreased from 24 to 12.5.