Optical testing of large SPDT mirrors using visible and IR interferometry

Physics – Optics

Scientific paper

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Infrared Interferometers, Mirrors, Alignment, Optical Equipment, Tests

Scientific paper

Rapid, quantitative, optical-interferometric measurements in the visible and IR ranges have been devised for the testing of large, single-point diamond-turned telescope mirrors and other reflective optics. A significant difference is noted between interferometric data taken in an ordinary laboratory environment and that obtained in a superstable environment, at the 0.6328-micron visible wavelength. IR phase-measuring interferometry virtually eliminates this problem, in any optical testing that does not require the extreme resolution of visible phase-measuring interferometry.

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