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Optics and Spectroscopy

Contours and widths of the self-alignment magnetooptical resonances in the presence of an intrinsic-emission-induced magnetic coherence exchange between levels

Sergey G. Rautian, Э. Г. Сапрыкин

Published Mar 1, 2002• 9 citations
Publisher

Abstract

Self-alignment magnetooptical resonances were investigated theoretically for magnetic coherence exchange between levels, which was induced by a discharge self-radiation or by electron collisions. The structure of the resonances was determined and the nonlinear pressure dependence of the resonance width in the presence of such exchange was established.

DOI
10.1134/1.1465458

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Self-alignment magnetooptical resonances were investigated theoretically for magnetic coherence exchange between levels, which was induced by a discharge self-radiation or by electron collisions. The structure of the resonances was determined and the nonlinear pressure dependence of the resonance width in the presence of such exchange was established.
The nonlinear Hanle effect is generally considered in the modern literature as a particular case of coherent population trapping (CPT) at degenerate Zeeman sublevels of the ground atomic state. The shape, amplitude, and sign of observed resonances and their dependence on the excitation parameters and observation geometry were investigated theoretically and experimentally in many studies because of the wide range of application of this effect. The sensitivity of Hanle resonances to the experimental conditions increases significantly in cells with antirelaxation coating, because the atomic ensemble retains its coherence after a large number of collisions with the cell walls. In this paper, the main attention is paid to the joint influence of the excitation radiation intensity and spurious magnetic fields on CPT resonances observed in fluorescence. The theoretical description is based on the numerical solution of an algebraic system of equations for density matrix ρ^\hat {\rho }ρ^​ in the formalism of irreducible tensor operators. The parameters relating different polarization moments in each equation are visualized using the modified sparse matrix of the system. It is established by numerical simulation that the shape, width, amplitude, and sign of nonlinear magnetooptical resonances change nonmonotonically with a change in the parameters of the excitation radiation and atomic system. The presented theoretical results are in good agreement with the experimental data obtained under various conditions.
A theoretical analysis is made of the resonant interaction between a traveling monochromatic light wave of arbitrary intensity and polarization and the 1/21/2 and 10 transitions in gas atoms in a magnetic field. An analysis is made of the influence of atomic collisions and coherence of the Zeeman sublevels of the terms on the structure of nonlinear magnetooptic resonances in the amplitude and polarization characteristics of the wave. Some features of nonlinear magnetooptic resonances for laser excitation of atoms from the ground state are noted. A study is made of the Faraday rotation and self-rotation of the polarization ellipse of the radiation as a function of the detuning of the wave frequency, the saturation parameter, and the optical density of the gas. The stability of the polarization of light in the medium is discussed. It is noted that these laws may be used to analyze and control the radiation characteristics of lasers and amplifiers when the level of saturation of a resonant gaseous medium in a magnetic field is high.
The dichroism of a neon gas discharge plasma in a weak magnetic field is investigated by scanning the 3 s 2 -2 p 4 transition by monochromatic laser radiation. Magneto-optical resonances of the intrinsic macroscopic alignment and hidden alignment of the 2 p 4 level are separated. Against the background of these resonances, resonances attributed to coherence transfer from the 1 s 2, 4, 5 levels and the birefringence of the wings of the nearest absorption lines from the 1 s 4, 5 levels are observed. A new type of alignment is revealed—integral hidden alignment, whose lifetime, in contrast to the case with macroscopic alignment, increases without bound with increasing radiation trapping.
Under conditions of interaction between a high-intensity traveling laser wave and the 3s2–2p4 neon transition, a narrow component due to saturation of high-order absorption was recorded in a difference magnetooptic resonance. This component was due to field-induced coherence between magnetic sublevels with the quantum numbers ±2 of the 2p4 level (hexadecapole moment) and was used to determine the relaxation constant Γ4n. The collisional broadening ∂Γ4n/∂p determined as a result of a mathematical analysis of the magnetic spectrograms was 3 ± 0.3 MHz/Torr. The collisional broadening of the alignment relaxation constant of the 2p4 level measured under the same conditions was 4 ± 0.2 MHz/Torr.