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Proceedings Paper

Infrared interferometer for optical testing
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Paper Abstract

An infra-red interferonieter for testing optical elements and assemblies in their operational wavelength band is described. The interferoineter is a phaseshifting, LUPI-style Twyman-Green interferometer operating at a wavelength of 3.392pm. The system is designed for optical testing in a vacuum chamber. For that purpose the interferometer is contained in a hermetic, vacuum-compatible enclosure, and all internal alignment functions are remotely controlled. The light source is an infrared HeNe-laser at 3392 p m. The camera sensing the interferograms consists of a PtSi CCD-array with 256x256 pixels. For operating the system in a vibration environment, short exposure pulses are generated from the laser light. In addition, a specialized phase.shifting data acquisition and reduction algorithm is employed which senses the random phase shifts and adapts the phase algorithm accordingly. A vacuum compatible diverger (f/2.5) and beam expander (250mm beam diameter) allow for a wide variety of optical testing configurations. Measurement results and system performance parameters are presented.

Paper Details

Date Published: 17 July 1996
PDF: 8 pages
Proc. SPIE 2860, Laser Interferometry VIII: Techniques and Analysis, (17 July 1996); doi: 10.1117/12.276308
Show Author Affiliations
Klaus R. Freischlad, Phase Shift Technology, Inc. (United States)
Jasmin Cote, Phase Shift Technology, Inc. (United States)

Published in SPIE Proceedings Vol. 2860:
Laser Interferometry VIII: Techniques and Analysis
Malgorzata Kujawinska; Ryszard J. Pryputniewicz; Mitsuo Takeda, Editor(s)

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