Vibration Insensitive Laser Unequal Path Interferometer (LUPI) Test

Chuck Hardesty

doi:10.1117/12.957842

25 December 1979 Vibration Insensitive Laser Unequal Path Interferometer (LUPI) Test

Chuck Hardesty

Proceedings Volume 0192, Interferometry; (1979) https://doi.org/10.1117/12.957842
Event: 23rd Annual Technical Symposium, 1979, San Diego, United States

Abstract

A 24 inch diameter segment of a 60 inch diameter, 10 meter focal length parabolic mirror was fabricated at Space Optics Research Labs. Due to the long focal length, a standard null test using a 24 inch flat could not be set up on our 12 foot air table. The test was set up in a long room which was subject to vibrations. A modification was made to a LUPI (Laser Unequal Path Interferometer) to allow the collimated reference beam to follow approximately the same path as the test beam. Adjustable flat mirrors for the reference beam were attached to the sides of the mounts for the parabola and flat. This combination allowed the r-,f,erence beam to "follow along" and pick up the same vibrations as the test beam. Good high contrast fringes were produced by this method. This paper will describe the test procedure and equipment. Additional problems of temperature, turbulence, and coherence will be summarized.

Citation Download Citation

Chuck Hardesty "Vibration Insensitive Laser Unequal Path Interferometer (LUPI) Test", Proc. SPIE 0192, Interferometry, (25 December 1979); https://doi.org/10.1117/12.957842

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