5 January 1994 New diode-laser light source for two-wavelength interferometry
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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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Klaus Gerstner, Klaus Gerstner, Theo T. Tschudi, Theo T. Tschudi, } "New diode-laser light source for two-wavelength interferometry", Proc. SPIE 2041, Mode-locked and Other Ultrashort Laser Designs, Amplifiers, and Applications, (5 January 1994); doi: 10.1117/12.165626; https://doi.org/10.1117/12.165626

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