Abstract

Investigation of processes of substance excitation

and light emission in intensive field inside dielectric microparticles

Ledneva G.P., Kotomtseva L.A., Astafieva L.G., Mazurenko A.S., Demidchuk L.V.

A purpose of the work is the elaboration of theoretical models of the internal microparticle lasing and selective excitation of the energy levels of atoms or molecules located inside the microparticle.

The semiclassical equations for the electromagnetic field and the inverted population are modified in view of the microparticle symmetry at the single and dual modes of the generation. The Schrodinger equation for various multilevel quantum systems with both adjacent and non-adjacent transitions induced by arbitrary modulated field is analytically solved.

For the first time stability regions of the stationary generation of an optical radiation in the microparticle formed by mixing both active substance and saturated absorber are determined. A change of the stimulated emitting probability at detuning of a resonant mode frequency from a resonant frequency of the active substance amplification was taken into account. The conditions of achieving the maximum level population in a three-level quantum system with any dipole transitions induced by arbitrary multifrequency laser field are determined.

Keywords: microlaser, saturating absorber, molecular selective excitation, multifrequency laser field.