近对称谐振腔的变换圆图解分析

利用传播圆-变换圆图解分析方法，通过对不同结构谐振腔的分析和对比，得出一种宜于推广的自锁模激光谐振腔——近对称谐振腔，其锁模运转易于启动且工作性能比较稳定；通过实验对近对称腔的工作性能进行了验证，并对一种五镜锁模腔进行了分析。五镜腔实质上等价于近对称四镜腔。

Evaluating intermediate frequency error property of wavefront of optical components with PSD collapse

Arithmetic of two-dimensional power spectral density(2-D PSD) of large optics wavefront was briefly described and PSDcollapse was introduced to evaluate the intermediate frequency error property of wavefront.As the PSD collapse is radon transform projec-tion of 2-D power spectral density at any angle,all valid data of wavefront of optics were used in calculation of the PSD collapse and thefeatures of 1-D PSD were inherited in PSD collapse.Although the PSD collapse is the same as 1-D PSD in unit and behaving style,it isbetter in evaluating intermediate frequency error property of optics wavefront than 1-D PSD or 2-D PSD.As PSD collapse calculation usesall valid data of evaluated optics wavefront and can be directly perceived through its profile,the PSD collapse is possibly the standard eval-uating method of PSD.