Vernier fringe-counting device for laser wavelength measurements
- 1 September 1983
- journal article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 54 (9) , 1138-1142
- https://doi.org/10.1063/1.1137537
Abstract
A vernier fringe-counting circuit designed for use with a Kowalski-type wavemeter is described. Wavelength measurements made with this device have a high reproducibility of 5×10−9 (or 1/50 of a fringe) and measured accuracy of 4×10−9. The results of accuracy tests are presented along with systematic errors incurred when the wavelengths of two He–Ne lasers (632.9 nm) are compared by the vernier method.Keywords
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