Vol. 20, issue 09, article # 2

Kochanov V.P. The influence of polarizability on saturated absorption at forbidden atomic transitions. // Atmospheric and oceanic optics. 2007. V. 20. No. 09. P. 696-702.
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Abstract:

The theory for saturated magnetic dipole and electric quadrupole absorption of monochromatic radiation at dipole-forbidden transitions of gas media is developed. It is shown that in the case of quasi-resonant polarizability, when the radiation frequency is close to the frequency of the transition from the upper level of a forbidden transition to the next upper state, the line shift for the absorption at dipole-forbidden transition can reach a large magnitude. The possibility of radiation amplification without population inversion at dipole-forbidden and quasi-resonant transitions is predicted for sufficiently high intensities and small frequency detuning from the eigenfrequency of quasi-resonant transition.

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