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Published February 15, 1983 | public
Journal Article Open

Measurement of the linewidth enhancement factor alpha of semiconductor lasers


A theory of the amplitude and phase modulation characteristic of a single mode semiconductor laser is presented. In this model the amplitude modulation couples through the complex susceptibility of the gain medium to the phase. We show that this coupling constant can be obtained by a high-frequency modulation experiment. This measured coupling constant is used to infer the linewidth enhancement factor as discussed by Henry, and Vahala and Yariv. Experiments confirmed the model and we measured a linewidth enhancement factor |alpha|=4.6±1.0 for a GaAlAs buried optical guide laser.

Additional Information

Copyright © 1983 American Institute of Physics. Received 15 October 1982; accepted 23 November 1982. The authors thank Dr. M. Nakamura of Hitachi Central Research Laboratories for providing the BOG and CSP lasers used in this experiment. This research was supported by the Office of Naval Research, the National Science Foundation under the Optical Communication Program and by the Army Research Office.


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