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Optical Engineering

Phase-Locked Interferometry
Author(s): Glen W. Johnson; Dennis C. Leiner; Duncan T. Moore
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Paper Abstract

A technique is described which converts in real time the fringe pattern resulting from two interfering beams into a wavefront map. The interferometer incorporates, as part of a servo system, a piezoelectrically driven mirror that is capable of applying both a known optical phase offset and a periodic optical phase modulation to one beam. The ac signal detected by a single photodiode is processed to generate an error signal for the servo system and a signal proportional to the optical phase difference between the two beams. Three instruments built on this principle will be discussed. The instruments are capable of detecting phase differences with a precision approaching A/100 and may be used for measuring surface topography (roughness, irregularity) or transparent phase objects such as biological samples, microballoons and gradient index materials.

Paper Details

Date Published: 1 February 1979
PDF: 7 pages
Opt. Eng. 18(1) 180146 doi: 10.1117/12.7972318
Published in: Optical Engineering Volume 18, Issue 1
Show Author Affiliations
Glen W. Johnson, University of Rochester (United States)
Dennis C. Leiner, University of Rochester (United States)
Duncan T. Moore, University of Rochester (United States)

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