Correlated spontaneous emission between two longitudinal modes in an extended-cavity semiconductor laser

Ohtsu, M.; Liou, K.-Y.
January 1988
Applied Physics Letters;1/4/88, Vol. 52 Issue 1, p10
Academic Journal
Recently, correlated spontaneous emission in a laser of three-level atoms has been analyzed theoretically and has been demonstrated experimentally using a three-level He-Ne Zeeman laser. We demonstrate that correlated spontaneous emission is also feasible in a semiconductor laser with a long extended cavity. As a result, the heterodyned spectral width between two lasing modes in a grating extended-cavity laser was reduced to below the spontaneous emission noise level. The laser can be used for high-precision optical-heterodyne sensing.


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