Abstract

A method for making accurate and precise measurements of small angles is described using an interferometer and a test fixture with reference control surfaces. The test is relatively insensitive to test fixture alignment. Typical measurement uncertainties are better than 0.2 arcsec (${{1}}\sigma$). This technique is applicable for verifying the angular stability of opto-mechanical systems that must undergo rigorous environmental testing.

© 2020 Optical Society of America

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