高斯光束低阶模焦点能量的相对分布

本文给出了高斯光束低阶横模聚焦后的焦点能量相对分布的解析解,并与不同放大倍率M值情况下的非稳腔单模远场聚焦特性进行比较。若以聚焦平面含激光总能量的80％作为光束发散角的统一基准,计算表明,在某些情况下,利用稳腔选模,可得到接近甚至优于非稳腔选模的良好光学质量,而且光腔结构简化,输出稳定性好及光电转换效率高。

Relative distribution at focal plane of low-order modes for Gaussian laser beams

Analytic resolution for relative energy distribution at focal plane of low-order modes for Gaussian laser beams is given. The results are compared with the focal properties at far-field of single mode light for unstable cavity with different magnification M. With. 80% of total laser energy at focal plane as the united criterion of beam divergence, calculation indicates that with stable cavity for mode-selection, one can obtain good beam quality which may be close, even superior, to that for mode-selection for unstable cavity under some conditions. Moreover, the stable cavity construction is simple, the cavity is more stable and the electro-optic efficiency is high as well.