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Optical Engineering

Automatic laser frequency locking to gas absorption lines
Author(s): Grady J. Koch
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Paper Abstract

An electronic circuit is developed for automating the implementation of a laser frequency-locking technique based on wavelength modulation spectroscopy. The locking scheme uses a zero-crossing as a reference point to line center generated by a derivative-like error signal. Prior implementations have suffered from a limitation in that the zero-crossing must be manually distinguished from the zero signal encountered when the laser is tuned far from line center. This disadvantage is eliminated by developing a circuit that automatically searches the laser's tuning range for an absorption peak and then engages the frequency lock. Both solid state and diode lasers are locked to absorption lines of gases including water vapor and carbon dioxide, with a long-term stabilization to within a few percent of the absorption linewidth.

Paper Details

Date Published: 1 June 2003
PDF: 4 pages
Opt. Eng. 42(6) doi: 10.1117/1.1572887
Published in: Optical Engineering Volume 42, Issue 6
Show Author Affiliations
Grady J. Koch, NASA Langley Research Ctr. (United States)

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