Duban M
Appl Opt. 2001 Apr 1;40(10):1599-608. doi: 10.1364/ao.40.001599.
For holographic gratings requiring an extreme dispersion, I consider a modified Rowland mounting, in which the recording laser sources are moved away from the grating, to reduce the uncorrected higher-order aberrations. In addition, I choose the geometric parameters such that first-type coma is corrected. Then a plane multimode deformable mirror (MDM) or two auxiliary spherical holographic gratings (R3 device) are used to aberrate the grating's recording sources; correction up to the fourth order is sufficient to obtain high image quality. Applied to the FUSE-Lyman (FUSE is Far Ultraviolet Spectroscopic Explorer) grating, with a groove density as high as 5767 grooves/mm, these recording devices produce a resolution (chromatic resolving power) as great as 611,000 with the MDM and 3,030,000 with the R3 device. These results far exceed the specified performance of 30,000. Since diffraction limits the resolution to 482,000, the images are diffraction limited with both devices.
对于需要极高色散的全息光栅，我考虑一种改进的罗兰装置，其中记录激光源远离光栅，以减少未校正的高阶像差。此外，我选择几何参数以校正第一类彗差。然后使用平面多模变形镜（MDM）或两个辅助球面全息光栅（R3装置）对光栅的记录源进行像差校正；高达四阶的校正足以获得高图像质量。应用于FUSE-莱曼（FUSE是远紫外光谱探测器）光栅，其刻槽密度高达5767线/毫米，这些记录装置使用MDM时产生的分辨率（色分辨本领）高达611,000，使用R3装置时高达3,030,000。这些结果远远超过了规定的30,000的性能。由于衍射将分辨率限制为482,000，两种装置的图像均受衍射限制。
