Malvezzi A M, Garifo L, Tondello G
Appl Opt. 1981 Jul 15;20(14):2560-5. doi: 10.1364/AO.20.002560.
Using two optical toroidal elements, a mirror and a grating, both working at grazing incidence, a spectrometer can be built that is stigmatic in the XUV region at one wavelength. Good compensation of the aberrations is achieved when the intermediate sagittal image is nearly at infinity. By varying the angle of incidence on the grating with simple movements, a given couple of optical elements could cover stigmatically a rather extended spectral range. If coupled with bidimensional array detectors, such a spectrograph could find applications in planned solar XUV telescopes.
使用两个光学环形元件、一个反射镜和一个光栅，它们都在掠入射角下工作，可以构建一台在一个波长的极紫外（XUV）区域具有无像散特性的光谱仪。当中间弧矢像几乎位于无穷远时，可实现像差的良好补偿。通过简单移动来改变光栅上的入射角，给定的一对光学元件可以无像散地覆盖相当宽的光谱范围。如果与二维阵列探测器相结合，这样的光谱仪可用于计划中的太阳XUV望远镜。
