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Optical and Quantum Electronics

Effect of driving laser intensity fluctuations on optical bistability of a system with large permanent-dipole molecules

V. R. Subrahmanyam, S. Chopra, Nitin C. Kothari, B.N. Gupta

Published Sep 1, 1985• 0 citations
Publisher
DOI
10.1007/bf00620398

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We study a single-mode laser system, whose active medium consists of molecules with a large difference between excited and ground electrical permanent-dipole moments. In this case, the Maxwell-Bloch equations are further coupled by nonlinear terms involving the ratio between this difference between the dipoles and the transition dipole moment. It is found that these new terms lead to multiple stationary solutions. From the linear stability analysis, we demonstrate the bistable (or multistable) character of the lasing solutions.
The effect of permanent dipole moments on the optical bistability of weak probe light in a unidirectional ring cavity with a three-level molecule is investigated. It is found that the intensity threshold of optical bistability and optical multistability can be controlled by quantum coherence induced by permanent dipole moments. It is shown that switching from optical bistability to optical multistability and lasing without population inversion can be occurred by this coherence under different conditions.
Optical bistability (OB) in a unidirectional ring cavity with a three-level Λ-type molecular system with nonzero permanent dipole moments is discussed. We found that in the (2+2)-transition processes, the permanent dipole moments induced new quantum coherence effects which lead to controlling the OB behavior of the system. Moreover, we showed that the group velocity can be switched from slow to fast or vice versa under specific conditions of difference in permanent dipole moments of the probe transition.