Environmental vibrations may cause the positive-branch confocal unstable cavity length to be maladjusted, moreover, thermal effect directly leads to cavity mirrors distortion.

• 摘要正支共焦非稳腔在出光过程中易受环境扰动而造成腔长失调，易受热积累影响而使腔镜变形，从而使输出光束产生离焦像差和部分其它像差。