Phase-Locked Interferometry

Glen W. Johnson; Dennis C. Leiner; Duncan T. Moore

doi:10.1117/12.7972318

1 February 1979 Phase-Locked Interferometry

Glen W. Johnson, Dennis C. Leiner, Duncan T. Moore

Author Affiliations +

Optical Engineering, Vol. 18, Issue 1, 180146 (February 1979). https://doi.org/10.1117/12.7972318

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.

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Glen W. Johnson, Dennis C. Leiner, and Duncan T. Moore "Phase-Locked Interferometry," Optical Engineering 18(1), 180146 (1 February 1979). https://doi.org/10.1117/12.7972318

Published: 1 February 1979

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