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Optoelectronics Instrumentation and Data Processing

Features of the 85Rb Spectrum in a Cell with an Antirelaxation Coating

A. Krasteva, Насыров Руслан Камильевич, Nikolay Petrov, S. Gateva, S. Cartaleva, K. A. Nasyrov

Published May 1, 2018• 5 citations
Publisher

Abstract

Distortion of the spectrum of the D 1 -line of 85 Rb in optical cells with an antirelaxation coating on the inner walls of the cell is studied. The spectrum shape is found to be significantly dependent on the velocity and direction of changes in the laser frequency. A physical explanation is provided for these features, which are confirmed by numerical simulations. The effect of the magnetic field on the spectrum shape is discussed.

DOI
10.3103/s8756699018030147

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Distortion of the spectrum of the D 1 -line of 85 Rb in optical cells with an antirelaxation coating on the inner walls of the cell is studied. The spectrum shape is found to be significantly dependent on the velocity and direction of changes in the laser frequency. A physical explanation is provided for these features, which are confirmed by numerical simulations. The effect of the magnetic field on the spectrum shape is discussed.
Significant modification of the spectrum of the D1 line of 85Rb in optical cells with high quality antirelaxation coating on the walls is studied experimentally and theoretically analyzed. The spectral profiles of hyperfine transitions are found to be significantly dependent on the velocity and the direction of the laser frequency scanning. A physical explanation is proposed for the observed features, which is confirmed by numerical simulations. The effect of small magnetic field on hyperfine spectrum is also discussed.
The specific features of absorption in a cell with an antirelaxation coating related to optical pumping and a finite rate of laser-frequency scanning are studied. The internal state of an atom in such cells is likely to remain unaltered after a collision with a wall. This results in optical pumping of an atomic ensemble over all velocities and the entire cell volume. Both the frequency corresponding to the maximum absorption in the D 2 line of 133 Cs and the absorption maximum itself depend on the sign of laser-frequency scanning. A theoretical model attributing the power dependence of asymmetry of the absorption contour of the 133 Cs D 2 line to the presence of cyclic transition levels in the system is presented.
In this communication, we present the results of a systematic study of the new behavior of Rb D1 fluorescence line profiles, for laser frequency detuning over the D1 line hyperfine structure observed in optical cell with anti-relaxation coating of high quality. Experimental spectra are analyzed by means of theoretical calculations of D1 line spectrum obtained by numerical simulation. The provided analysis makes it possible to specify the physical processes responsible for the modification of the shape and the amplitude of the fluorescence line profiles. In addition, the experimentally observed dependences of the measured spectrum on the rate and the direction of laser frequency scan are analyzed.
Abstract Absorption features in cells with antirelaxation coating in D2 -lines of alkali metal atoms due to the competition of cyclic and open transitions lying within the Doppler contour are studied. In cells of this type ensemble of atoms is optically pumped over all velocities and the entire volume of the cell during the characteristic time T, which noticeably exceeds local pumping times related to resonant atomic velocities. If the frequency scanning T, the retardation effect results in significant distortion of the laser wave absorption contour and to emergence of the hysteresis phenomenon. The developed theory for a realistic scheme of atomic levels with one cyclic and two open transitions describes experimentally observed absorption contours, their dependence on the light power and the frequency scanning direction.
We study the peculiarities of the absorption spectra in D1,2-lines of Cs, caused by optical pumping in cells with antirelaxation coating. In these cells the internal state of the atom, which arose under optical pumping by a monochromatic laser field, is preserved with a high probability in a collision with the wall. As a result, the optical pumping action extends to the entire volume of the cell and to all the velocities of the atoms. This leads to the speed-dependent scanning distortions of the absorption line profile. The detected features should be considered when using laserpumped quantum magnetometers with antirelaxation-coated cells.