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17th Congress of the International Commission for Optics: Optics for Science and New Technology

Steady-state intenstity of lasing with or without inversion in a simple three-level atomic system

Shangqing Gong

Published Sep 1, 1996• 0 citations
Publisher

Abstract

We, using a nonlinear theory of laser physics, investigate for a simple three-level atomic system the steady-state intensity behavior due to the effects of quantum coherence and decoherence. We find that the steady-state intensity of the laser field can arrive at a maximal value for a certain Rabi frequency of the driving field. We also find that the linear gain and the laser intensity tend to decrease for the linewidth of the driving field.

DOI
10.1117/12.2316096

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We, using a nonlinear theory of laser physics, investigate for a simple three-level atomic system the steady-state intensity behavior due to the effects of quantum coherence and decoherence. We find that the steady-state intensity of the laser field can arrive at a maximal value for a certain Rabi frequency of the driving field. We also find that the linear gain and the laser intensity tend to decrease for the linewidth of the driving field.
The steady-state behavior of a simple three-level atomic system has been investigated by taking into account the effect of phase fluctuations in the driving field. For a monochromatic driving field, lasing with or without inversion can be established over a wide frequency range for the probe and driving fields. A large refractive index can also be generated even if the population inversion is positive. For a finite linewidth of the driving field, the refractive index enhancement tends to decrease. Furthermore, a behavior change from inversion laser to noninversion laser can occur as the driving field linewidth increases.
We analyze a laser system consisting of N closed three-level atoms confined in a single-mode cavity and derive the conditions for the onset of lasing without inversion or with inversion. We calculate the steady-state gain and lasing in the system and show that far above the lasing threshold, depending on the pumping and decay rates, the inversionless laser may operate in three different regimes, where the intensity of the laser depends linearly on N, is proportional to \ensuremath{\surd}N , or independent of N.