Schwenker J P
Appl Opt. 1992 Oct 1;31(28):6102-6. doi: 10.1364/AO.31.006102.
In order to take full advantage of modern, multiple-element detectors, the astigmatism in traditional plane grating instrument designs must be significantly reduced. Slight cylindrical distortions of the plane grating are shown to correct astigmatism near the plane of dispersion without significantly altering spectral resolution. Basic geometrical theory for all in-plane systems is presented. Extensions to other slight distortions such as anticlastic or toroidal surfaces are given. Limitations imposed by image degradation away from the plane of dispersion are discussed. Ray traces of a representative system are explored. Results and images from a test system that incorporates a cylindrical grating made from a plane master grating are presented.
为了充分利用现代多元探测器，传统平面光栅仪器设计中的像散必须大幅降低。研究表明，平面光栅的轻微柱面畸变可在色散平面附近校正像散，而不会显著改变光谱分辨率。文中给出了所有平面内系统的基本几何理论。还介绍了向其他轻微畸变（如双曲面或环面）的扩展。讨论了远离色散平面时图像退化所带来的限制。对一个代表性系统进行了光线追迹研究。展示了一个包含由平面母光栅制成的柱面光栅的测试系统的结果和图像。
