Correlated Spontaneous Emission Between Two Longitudinal Modes in an Extended-Cavity Semiconductor Laser.
01 January 1988
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.