Shevy, Y. and Ianelli, J. and Kitching, J. and Yariv, A. (1992) Self-quenching of the semiconductor laser linewidth below the Schawlow-Townes limit by using optical feedback. Optics Letters, 17 (9). pp. 661-663. ISSN 0146-9592. http://resolver.caltech.edu/CaltechAUTHORS:SHEol92
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We demonstrate theoretically and experimentally self-quenching of the fundamental semiconductor laser frequency fluctuations to a level that is orders of magnitude below the Schawlow-Townes limit for a solitary laser. It is shown that the main operative mechanism is the combined action of a frequency-dependent internal loss and amplitude-to-phase coupling. The internal frequency-dependent loss is introduced by means of spectrally narrow external optical feedback, which provides a strong frequency-dependent dispersion. Linewidth reduction by a factor of 2 X 10^3 is demonstrated by using a narrow Doppler-free Faraday resonance in Cs vapor.
|Additional Information:||© Copyright 1992 Optical Society of America. Received November 19, 1991. This research was supported by the Defense Advanced Research Projects Agency, the U.S. Office of Naval Research, and the U.S. Air Force Office of Scientific Research. We also thank M. Nakamura and T. Kajimura of Hitachi's Central Research Laboratories, Tokyo, Japan, for the generous donation of the laser used in our experiments.|
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|Last Modified:||26 Dec 2012 09:32|
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