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International Conference Laser Optics (ICLO)

Nonlinear resonances in polarization spectrum of three-level atom, interacting with weak polychromatic fields

A. G. Antipov, I V Korshok, N. I. Matveeva, S. A. Pulkin, Svetlana Savel’eva, Svetlana Uvarova, Вера Ивановна Яковлева

Published Jun 1, 2018• 0 citations
Publisher

Abstract

For three-level system of atoms interacting with polychromatic fields, the system of differential equations of the density matrix is analytically solved and the polarization spectrum of the components of the probe field is calculated. Supernarrow resonances in polarization spectrum at the frequency of the probe field occur at multiple harmonics, subharmonics, and on a frequency that is mirror-to-field.

DOI
10.1109/lo.2018.8435843

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For three-level system of atoms interacting with polychromatic fields, the system of differential equations of the density matrix is analytically solved and the polarization spectrum of the components of the probe field is calculated. Supernarrow resonances in polarization spectrum at the frequency of the probe field occur at multiple harmonics, subharmonics, and on a frequency that is mirror-to-field.
A three-level atomic system with a strong three-mode field and a probing biharmonic field at transitions 1→2 and 1⇆3 (1 is a common lower level), respectively, is studied theoretically by numerical simulation and an analysis of the mathematical expressions derived for the particular case of a symmetric arrangement of the strong field components relative to the transition frequency ω 21 . The absorption spectrum of the probing field components contains parametric supernarrow resonances against the background of resonances of the nonlinear interference effect. The ratios of the differences in the frequencies of the strong and probing fields, at which the supernarrow resonances appear, are found analytically. The results coincide with those obtained from numerical simulation.
Analytic solutions of the optical Bloch equations for a two-level atom interacting with a strong polychromatic field whose frequencies are symmetrically positioned with respect to the atomic frequency are used to obtain the polarization spectrum of the atom. The spectrum is found to consist of a series of discrete peaks or dips superimposed on the continuous part of the spectrum. Physical interpretation of resonances exhibited in the continuous part of the spectrum is given using a semiclassical dressed-atom approach.
Summary form only given, as follows. One of the leading directions of nonlinear laser spectroscopy is a study of interaction of radiation with material. The purpose of the work is to research effects of amplification of radiation without creation of initial inversion of population levels in three-level atomic media. Calculation of generation parameters in three-level systems on the main transition will allow to get a generation at frequencies where creating the usual lasers is difficult (ultraviolet and X-ray area).