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Published July 1, 1993 | public
Journal Article Open

Linewidth reduction and frequency stabilization of a semiconductor laser with a combination of FM sideband locking and optical feedback


We describe a novel method for semiconductor laser noise reduction that uses a combination of optical and electronic feedback. A Doppler-free Faraday resonance in Cs vapor provided both optical feedback and discrimination for an electronic feedback scheme incorporating FM sideband spectroscopy. The introduction of electronic feedback further reduced the low-frequency fluctuation noise power by more than 2 orders of magnitude, resulting in a linewidth of 1.4 kHz.

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© Copyright 1993 Optical Society of America. Received February 3, 1993. This research was supported by the Defense Advanced Research Project Agency, the U.S. Office of Naval Research, and the U.S. Air Force Office of Scientific Research. J. Kitching thanks the National Science and Engineering Research Council of Canada for financial support.


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August 22, 2023
August 22, 2023