Abstract
Abstract. A modified Twyman-Green interferometer is in use that makespossible wavefront testing of optical filters at any wavelength from 200to 1100 nm. The use of mirrors for collimation and pupil imaging makesthe instrument achromatic, and therefore the focus is fixed over the en-tire 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 selectionof any wavelength. Fringe distortion, even when the collimating mirror isspherical, is small enough to keep measurement errors within 0.1 wavepeak-to-valley over the 2- x 2-in, aperture. Subject terms: infrared technology; Twyman-Green interferometer; interference;optical testing; image quality; broadband achromatic interferometer.Optical Engineering 33(3), 771—775 (March 1994).3. be convenient to use, relatively insensitive to vibration,and portable4. operate in normal room light.The challenges expected included the following:
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