NOISE-REDUCTION, LASING WITHOUT INVERSION, AND PUMP STATISTICS IN COHERENTLY PREPARED LAMBDA QUANTUM-BEAT MEDIA
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Date
1992
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Abstract
Amplitude-noise reduction and diminished losses are found in a laser system in which the lower level of the usual two-level atom is replaced by a coherently prepared doublet, i.e., a lambda quantum-beat configuration. The role of atomic coherence between the various levels and regular pumping is investigated. When a portion of the output signal is reflected from a phase-conjugate mirror and reinjected into the laser, the locking phase can be altered and a large phase-noise reduction can be obtained.