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Smoke and Mirrors: Ultra-Rapid-Scan FT-IR Spectrometry

This slide shows a series of variations on the precessing disk interferometer. The same tilt-compensating optics can be used with a variety of planar reflectors with considerable freedom for implementing mirror motion - tilt, translation and shear are represented here. These designs appear to be novel to spectroscopic uses, but at least one has appeared in the prior art of metrology. The general disadvantages of all of these designs (for spectroscopic applications) are that the cube corner and planar reflectors must have apertures at least twice as large as the collimated beam diameter, the folding requires that the beam paths be relatively long, and the resolution is limited by the movement of the beam images on the disk. These are acceptable tradeoffs in certain cases.

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