Hill R A
Appl Opt. 1969 Mar 1;8(3):575-81. doi: 10.1364/AO.8.000575.
A design for a new plane grating monochromator is described. The system employs a symmetrical configuration of off-axis paraboloids for both the collimator and camera mirrors. The entrance and exit slits are mounted on the same side of the grating and are curved in order to eliminate wavelength errors due to spectral line curvature. There is, in fact, a remarkable coincidence between the curvature which is required to avoid wavelength errors and the curvature which is required to obtain equal curvatures in the object and image planes. Ray tracing calculations for a symmetrical configuration of off-axis paraboloids show that the image of a curved slit with a length equal to 0.05 times the focal length of an f/5 mirror is diffraction limited for wavelengths lambda > 0.2 . micro.
本文描述了一种新型平面光栅单色仪的设计。该系统在准直镜和成像镜中均采用离轴抛物面的对称配置。入射狭缝和出射狭缝安装在光栅的同一侧，并呈弯曲状，以消除由于光谱线弯曲而产生的波长误差。实际上，避免波长误差所需的曲率与在物平面和像平面中获得相等曲率所需的曲率之间存在显著的一致性。对离轴抛物面的对称配置进行光线追迹计算表明，对于波长λ>0.2微米，长度等于f/5镜焦距0.05倍的弯曲狭缝的像受衍射限制。
