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Proceedings Paper

New diode-laser light source for two-wavelength interferometry
Author(s): Klaus Gerstner; Theo T. Tschudi
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Paper Abstract

Two-wavelength interferometry is a well known technique to enlarge the ambiguity range of conventional interferometric systems without loss of resolution. Two laser emission lines with a spectral distance of a few nm form a so-called synthetic wavelength, which is used for absolute ranging. Due to the lack of an inexpensive and compact light source providing for a tunable synthetic wavelength, two-wavelength interferometry has been without technical importance up to now. We present a new light source for absolute ranging two-wavelength interferometry based on stabilized semiconductor lasers. Two semiconductor lasers operating at different wavelengths are prestabilized concerning their chip temperatures and their injection currents. Then the generated synthetic wavelength is stabilized directly by a Fabry Perot resonator. The stability and the performance of the synthetic wavelength control is shown.

Paper Details

Date Published: 5 January 1994
PDF: 8 pages
Proc. SPIE 2041, Mode-locked and Other Ultrashort Laser Designs, Amplifiers, and Applications, (5 January 1994); doi: 10.1117/12.165626
Show Author Affiliations
Klaus Gerstner, Technische Hochschule Darmstadt (Germany)
Theo T. Tschudi, Technische Hochschule Darmstadt (Germany)

Published in SPIE Proceedings Vol. 2041:
Mode-locked and Other Ultrashort Laser Designs, Amplifiers, and Applications
Michel Piche; Paul W. Pace, Editor(s)

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