Rotating Shearing Plate Interferometer

W . C. Sweatt; R. C. Duffus

doi:10.1117/12.978899

1 January 1987 Rotating Shearing Plate Interferometer

W . C. Sweatt, R. C. Duffus

Proceedings Volume 0818, Current Developments in Optical Engineering II; (1987) https://doi.org/10.1117/12.978899
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

The rotatable shearing plate interferometer provides a fast and simple manual method of measuring defocus, astigmatism and coma in a collimated laser beam. The shearing plate is mounted at a 45 degree angle relative to the incident beam. The plate in its housing is rotated about the axis of the incident beam. This allows the beam to be sheared in the horizontal, the vertical, or any other direction. Astigmatism and defocus can be calculated from fringe tilt measurements taken at any three angles, for example, 0, 45 and 90 degrees. Coma can be calculated from fringe curvatures measured at 0 and 90 degrees.

Citation Download Citation

W . C. Sweatt and R. C. Duffus "Rotating Shearing Plate Interferometer", Proc. SPIE 0818, Current Developments in Optical Engineering II, (1 January 1987); https://doi.org/10.1117/12.978899

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