Abstract
The role of level degeneracy in resonant nonlinear phenomena is examined by considering theJ=1 →J=0 atomic transition. The atomic medium is modelled as a homogeneously broadened three-level system and a closed-form expression for the medium susceptibility is obtained. It is used to discuss several nonlinear phenomena such as saturated absorption, optical bistability, and phase conjugation. The two-photon-induced coupling of the ground-state Zeeman sublevels leads to interesting polarization effects.
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Agrawal, G.P. Level-degeneracy effects in resonant nonlinear phenomena: Three-level atomic model. Pramana - J Phys 22, 293–301 (1984). https://doi.org/10.1007/BF02846381
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DOI: https://doi.org/10.1007/BF02846381