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Journal of Optical Technology

The second laser threshold with up-conversion

R. A. Vlasov, Alexander M. Lemeza, S. Yu. Mikhnevich

Published Nov 1, 2006• 0 citations
Publisher

Abstract

The influence of an additional relaxation channel of up-conversion type on the second threshold of a laser with a dense homogeneously broadened active medium is investigated in terms of a two-level model. Local-field effects caused by near dipole-dipole interactions are taken into account in this case. It is shown that the bad-cavity condition is not obligatory for chaotic behavior to appear in a laser system and that the second laser threshold can be substantially reduced by the up-conversion process.

DOI
10.1364/jot.73.000786

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The influence of an additional relaxation channel of up-conversion type on the second threshold of a laser with a dense homogeneously broadened active medium is investigated in terms of a two-level model. Local-field effects caused by near dipole-dipole interactions are taken into account in this case. It is shown that the bad-cavity condition is not obligatory for chaotic behavior to appear in a laser system and that the second laser threshold can be substantially reduced by the up-conversion process.
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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