Controlling the optical bistability via interacting dark-state resonances
Physics Department, Zanjan University, P.O. Box 45195, -313, Znjan, Iran
2 Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, Iran
Corresponding author: firstname.lastname@example.org
Revised: 16 December 2009
Published online: 26 January 2010
We analyze the behavior of optical bistability in a four-level mercury atomic system driven by a cavity and two external coherent fields by means of a unidirectional ring cavity. We find that without interacting dark resonances and for large intensity of coupling field, the optical bistability disappears. So, the double dark resonances could significantly establish the optical bistability. Moreover, we demonstrate that the double dark resonances can dramatically reduce the threshold of optical bistability.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2010