Lotem H
Appl Opt. 1994 Mar 1;33(7):1260-3. doi: 10.1364/AO.33.001260.
A novel compact spectrograph, based on double diffraction by a strip-shaped grating at a grazing angle combined with a tuning mirror, is theoretically discussed. In this configuration the emerging light illuminates a large number of grooves, leading to high spectral resolution. It is shown that with large f-number optics, using a detector array, one may obtain high resolution in spite of the compact spectrograph structure. At grazing incidence the transmission and dispersion of the spectrograph depend strongly on wavelength. The grating's low efficiency and the large f-number may be compensated for by an efficient data acquisition, which may be attained with a detector array. An advantage of the geometry is that most of the original beam may be obtained as a collimated output through the zero-order reflection from the fixed grating.
本文从理论上讨论了一种新型紧凑型光谱仪，该光谱仪基于条形光栅在掠射角下的双衍射并结合调谐镜。在这种配置下，出射光会照射大量的刻槽，从而实现高光谱分辨率。结果表明，尽管光谱仪结构紧凑，但使用大相对孔径光学系统和探测器阵列，仍可获得高分辨率。在掠入射时，光谱仪的透射率和色散强烈依赖于波长。光栅的低效率和大相对孔径可通过高效的数据采集来补偿，这可通过探测器阵列实现。这种几何结构的一个优点是，大部分原始光束可通过固定光栅的零级反射作为准直输出获得。
