Carlson R W
Appl Opt. 1969 Jun 1;8(6):1129-32. doi: 10.1364/AO.8.001129.
The optical design of a double monochromator suitable for use in the extreme uv is presented. The system employs fixed entrance and exit slits and two concave diffraction gratings which are rotated to vary the wavelength at the exit slit. Adjustment of the optical parameters and use of symmetry produces an approximate focusing condition accurate to fourth order in grating rotation. The defocusing at the exit slit is comparable to the Seya mounting. The astigmatism is calculated and the transmission properties briefly discussed.
介绍了一种适用于极紫外光的双单色仪的光学设计。该系统采用固定的入射和出射狭缝以及两个凹面衍射光栅，通过旋转光栅来改变出射狭缝处的波长。通过调整光学参数并利用对称性，可产生一种近似聚焦条件，在光栅旋转时精确到四阶。出射狭缝处的散焦与塞亚装置相当。计算了像散并简要讨论了传输特性。
