In this chapter, the optical system's throughput for FT spectrometers is discussed first, and with the aim to help the designer select the proper size and "speed" of the focusing and the collimating optics, the diameter of the aperture, and the area of the detector element. Lenses and mirrors, the two types of focusing and collimating optics, are also briefly discussed. Finally, the alignment procedure for the interferometer is explained.
Optical throughput was defined in Sec. 1.3. It is revisited here and considered from an overall system perspective. In FT spectrometers, optical throughput is limited by either the interferometer's collimating optics or the detector's focusing optics.
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