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1 October 1993 Development of a broadband achromatic Twyman-Green interferometer
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A modified Twyman-Green interferometer is in use that makes possible wavefront testing of optical filters at any wavelength from 200 to 1100 nanometers. The use of mirrors for collimation and pupil imaging makes the instrument achromatic, and therefore the focus is fixed over the entire bandwidth. The beamsplitter and compensator plates are made of fused silica, and the detector is a UV enhanced CCD tv camera. A tunable monochrometer with a broadband light source permits selection of any wavelength. Fringe distortion, even when the collimating mirror is spherical, is small enough to keep measurement errors within 0.1 wave peak to valley over the 2 by 2 inch aperture.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lawrence J. Steimle and Yaujen Wang "Development of a broadband achromatic Twyman-Green interferometer", Proc. SPIE 2019, Infrared Spaceborne Remote Sensing, (1 October 1993);

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