Distance measurement method using the two intermode beat frequencies of a three-longitudinal mode He–Ne laser

The frequency of a three-longitudinal mode He–Ne laser was stabilized by the method of detecting the secondary beat frequency between modes. The stabilized laser has been efficiently used as a laser source for a distance meter. In distance measurement, two intermode beat frequencies (875 MHz, 145 kH...

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Bibliographic Details
Published in:Review of scientific instruments 1997-12, Vol.68 (12), p.4612-4614
Main Authors: Eom, Ick-Jae, Kim, Kyung-Chan, Suh, Ho-Sung
Format: Article
Language:English
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Summary:The frequency of a three-longitudinal mode He–Ne laser was stabilized by the method of detecting the secondary beat frequency between modes. The stabilized laser has been efficiently used as a laser source for a distance meter. In distance measurement, two intermode beat frequencies (875 MHz, 145 kHz) were, respectively, used as a modulation frequency instead of an optical modulator. The resolution of the distance meter was higher than 20 μm. The total uncertainty was within 20 μm by correction of errors except for the uncertainty of the refractive index of the air.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1148442