Principle for measurement of micrometer and nanometer displacement and air refractivity based on laser mode split technology and lasing action

Shulian Zhang; Ming Tang

doi:10.1117/12.179361

1 October 1994 Principle for measurement of micrometer and nanometer displacement and air refractivity based on laser mode split technology and lasing action

Shulian Zhang, Ming Tang

Author Affiliations +

Optical Engineering, Vol. 33, Issue 10, (October 1994). https://doi.org/10.1117/12.179361

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.

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Shulian Zhang and Ming Tang "Principle for measurement of micrometer and nanometer displacement and air refractivity based on laser mode split technology and lasing action," Optical Engineering 33(10), (1 October 1994). https://doi.org/10.1117/12.179361

Published: 1 October 1994

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