30 August 2017 Differential shearing interferometer
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Abstract
We present a novel interferometer that we call the differential shearing interferometer (DSI). It incorporates a set of Risley prisms in a Sagnac interferometric configuration. The Risley prisms deviates the beam in both propagation directions. This interferometer interferes two beams displaced in the same direction, but with different magnitudes. The resultant interferogram is the directional derivative of the wavefront. The interferometer sensitivity depends on the difference between the beam deviations. This deviation is controlled by the position of the Risley prisms inside the beam path and their angular orientations. The advantages of quasi-common-path configuration include its low sensitivity to vibrations.
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Beethoven Bravo-Medina, Guillermo Garcia-Torales, Marija Strojnik, Azael Mora-Nuñez, Eduardo de la Fuente, "Differential shearing interferometer", Proc. SPIE 10403, Infrared Remote Sensing and Instrumentation XXV, 104030Z (30 August 2017); doi: 10.1117/12.2275343; https://doi.org/10.1117/12.2275343
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