Journal
JOURNAL OF LUMINESCENCE
Volume 131, Issue 8, Pages 1682-1686Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2011.03.050
Keywords
Optical bistability; Spontaneously generated coherence
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We investigate the optical bistability (OB) and optical multi-stability (OM) in a four-level N-type atomic system. The effect of spontaneously generated coherence (SGC) on OB and OM is then discussed. It is found that SGC makes the medium phase dependent, so the optical bistability and multi-stability threshold can be controlled via relative phase between applied fields. We realize that the frequency detuning of probe and coupling fields with the corresponding atomic transition plays an important role in creation OB and OM. Moreover, the effect of laser coupling fields and an incoherent pumping field on reduction of OB and OM threshold is then discussed. (C) 2011 Elsevier B.V. All rights reserved.
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