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Acta Optica Sinica

Analysis of two-field bistabilities in optically pumped sub-millimeter laser

Chen Jishu

Published Jan 1, 1993• 0 citations
OpenAlex

Abstract

The bistabilities of the pumping laser and the emitting laser in an optically pumped sub-millimeter laser are studied by using a three-level homogeneously broadened two-field semiclassical model. The bistable behaviour varies drastically with the damping rates of the variables of the media. The emergence of bisability is governed by properly choosing the absorptive and gain coefficients of the media and the cavity damping coefficients.

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The bistabilities of the pumping laser and the emitting laser in an optically pumped sub-millimeter laser are studied by using a three-level homogeneously broadened two-field semiclassical model. The bistable behaviour varies drastically with the damping rates of the variables of the media. The emergence of bisability is governed by properly choosing the absorptive and gain coefficients of the media and the cavity damping coefficients.
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We investigate the laser equations in the mean-field limit for a homogeneously broadened two-level system, taking into account the local-field correction arising from dipole-dipole interactions. Our analysis concentrates on the dynamical properties of the laser versus the pumping parameter. The effect of detuning between atomic and cavity frequencies is also studied. We first show that the local-field correction reduces the range of the chaotic regime when the frequency detuning is set for minimum instability threshold operation. For a fixed local-field correction, we demonstrate that the symmetry of the dynamical scenario versus the frequency detuning is broken. In addition, we point out generalized bistability between the chaotic regime and the off state of the laser. This bistability results from the smallness of the basins of attraction of the off state.
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