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Published June 15, 1985 | public
Journal Article Open

Passive and active mode locking of a semiconductor laser without an external cavity


This letter describes the first attempt to passively and actively mode lock a discrete semiconductor laser, i.e., one not coupled to an external cavity. Beat notes of the longitudinal modes of a 1.97-mm-long GaAlAs laser have been observed at 17.7 GHz. The spectral width of the beat note was approximately 100 kHz. Stable passive mode locking has been observed under appropriate operating conditions. Active mode locking by an externally injected microwave signal was also achieved.

Additional Information

© 1985 American Institute of Physics. Received February 1985; accepted 12 March 1985. This work is supported by the Defense Advance Research Project Agency and Naval Research Laboratory.


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