Noise reduction, lasing without inversion, and pump statistics in coherently prepared λ quantum-beat media
- 1 April 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 45 (7) , 4872-4878
- https://doi.org/10.1103/physreva.45.4872
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 λ 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.Keywords
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