针对传统单片柱透镜和柱面反射镜成像光束不理想以及视场通常小于1°,提出并设计了一种三反射式柱面结构。对柱面光线追迹及单片柱面镜成像进行了深入分析,分别设计了三反射式圆柱面和二次曲线柱面系统,提出了一种基于抛物柱面镜理想线聚焦的新型像差优化方法,使其在子午面方向各视场调制传递函数得到最佳优化,并达到成像光谱仪等在狭缝方向上高空间分辨率要求。其子午面总视场均达到了3°,在45 lp/mm分辨率条件下,边缘视场子午面方向的调制传递函数分别优于0.2和0.6。

A single cylindrical reflector usually has defects of distortional imaging beam and limited field of view usually less than 1°. A three cylindrical reflectors system is presented to overcome these defects. Based on the ray tracing of cylindrical reflector, a three circularly cylindrical reflectors and a three conic-cylindrical reflectors system have been designed. The full field of view (FOV) has reached 3° in tangential plane; on the edge of FOV, the modulation transfer function (MTF) of the former design at 45 lp/mm is better than 0.2 and the latter is better than 0.6. A new optimization method using parabolic-cylindrical reflector is presented. This method can be used to optimize the MTF in tangential plane, and the final MTF satisfies the requirement of the high spatial resolution in imaging spectrometer field.