Length measurement using infrared two-wavelength He–Xe laser interferometer
- 1 May 1982
- journal article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 53 (5) , 641-643
- https://doi.org/10.1063/1.1137034
Abstract
The results of length measurements made with a 800-mm-long gauge block, using an infrared interferometer whose light source is a 3.51– 3.37-μm simultaneous operation He–Xe laser, are described. The wavelength ratio of the 3.51-μm line to the 3.37-μm line is determined to an accuracy of 1.7×10−8 and the absolute length of the gauge block is uniquely determined to an accuracy of 4.9×10−8 by the method of excess fractions. This interferometer has a possibility of measuring lengths up to several meters.Keywords
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