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Optical Engineering

Principle for measurement of micrometer and nanometer displacement and air refractivity based on laser mode split technology and lasing action
Author(s): Shulian Zhang; Ming Tang
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Paper Abstract

A principle is presented that uses a longitudinal mode splitting laser to sense the microdisplacement and measure the air refractivity with very simple construction, large measurement ranges, high sensitivity, and precision. The phase differences of two power curves of the split modes can be used to judge the movement direction, and the number of the Lamb dips and mode-change dips can be used to measure micrometer displacement. Because of the anamolous dispersion, the relative variation of the beat frequency is the function of the change of cavity length, which is the basis of measuring nanometer displacement.

Paper Details

Date Published: 1 October 1994
PDF: 7 pages
Opt. Eng. 33(10) doi: 10.1117/12.179361
Published in: Optical Engineering Volume 33, Issue 10
Show Author Affiliations
Shulian Zhang, Tsinghua Univ. (China)
Ming Tang, Tsinghua Univ. (China)

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