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Journal of Physics Conference Series

Optical control of coherent magneto-optical resonances in potassium

S. Tsvetkov, S. Gateva

Published Feb 1, 2024• 0 citations
Publisher

Abstract

Abstract The influence of Light Induced Atomic Desorption (LIAD) on the potassium D2 line magneto-optical resonances in uncoated buffer-gas optical cell is investigated. LIAD effect reduces the drawbacks of conventional heating for achieving high atomic density that is essential for many spectroscopy-based applications. Another feature of LIAD is the impact on the dwelling time of the atoms when colliding with the surface of the cell. In this work we investigate LIAD from point of view to distinguish the influence of LIAD on the atomic density from the dwelling time as well as to control and improve the parameters of magneto-optical resonances in potassium vapor. The results are interesting for development of new precise optical sensors and devices for various applications.

DOI
10.1088/1742-6596/2710/1/012026

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Abstract The influence of Light Induced Atomic Desorption (LIAD) on the potassium D2 line magneto-optical resonances in uncoated buffer-gas optical cell is investigated. LIAD effect reduces the drawbacks of conventional heating for achieving high atomic density that is essential for many spectroscopy-based applications. Another feature of LIAD is the impact on the dwelling time of the atoms when colliding with the surface of the cell. In this work we investigate LIAD from point of view to distinguish the influence of LIAD on the atomic density from the dwelling time as well as to control and improve the parameters of magneto-optical resonances in potassium vapor. The results are interesting for development of new precise optical sensors and devices for various applications.
An investigation of the influence of light-induced atomic desorption (LIAD) on the transmission spectra from point of view of LIAD application for miniaturization of magneto-optical sensors and anti-relaxation coatings diagnostics is reported. With reduction of the dimensions of the cells, the amplitude of the signals decreases and it can be compensated by increasing the atomic density with temperature using special high temperature anti-relaxation coatings, or by LIAD. LIAD is a non-thermal process in which atoms adsorbed at a surface are released under illumination. It is investigated in various papers and has different applications - vapor density stabilization, MOT loading, surface nanostructuring etc. In this work the dependence of the shape of the absorption spectra on the laser power and blue light power is measured and analysis of the influence of different factors is done. All measurements are performed on the Rb D2 line in 3 different vacuum cells (uncoated, paraffin coated and SC-77 coated) with a 460 nm light emitting diode illumination. The good knowledge of the factors influencing the alkali atom spectra will be useful not only for the development of new alloptical sensors, but for study atom-dielectric surface interactions and development of new all-optical methods for surface and coating diagnostics.
This work is devoted to a systematic study of the effect of Light-Induced Atomic Desorption (LIAD). LIAD is a non-heating process in which atoms adsorbed on a surface are desorbed by illumination with non-resonant light. The aim of the dissertation is an experimental study of the LIAD process, its influence on the spectra of alkali atoms in optical cells without and with Anti-Relaxation Coating (ARC) and the possibilities of LIAD for optical characterization of ARC, as well as in high resolution spectroscopy. For the first time, the LIAD process under homogeneous illumination was investigated experimentally, whereby the efficiency of the LIAD was significantly increased even for a cell without ARC, the dynamic characteristics are obtained with a better signal to noise ratio and repeatability, and the desorption and adsorption processes are faster. LIAD effect in cells with different ARC coatings has shown that each coating has different desorption and adsorption rates and the results obtained show the possibility of applying the method for optical characterization of ARC. An experimental study of the number of collisions without atomic spin depolarization in cells with different ARCs and the impact of LIAD was performed, as well as various parameters such as laser intensity and cell temperature were investigated.
We report some preliminary results on experimental investigation of the potential of Light Induced Atomic Desorption (LIAD) applications for density control in antirelaxation coated cells and coherent spectroscopy. LIAD is a non-thermal process whereby atoms adsorbed on a surface are released under illumination. It is applied mostly to implementing optical atomic dispensers in the cases when high atomic density at low temperature is needed - for example, for loading atomic devices as atomic magnetometers, atomic clocks, atomic traps and their miniaturization. An advantage of the light control is that it is faster than the temperature control. More than an order of increase of the density with LIAD is obtained. Some peculiarities in the 780 nm absorption and fluorescence spectra registered in dense Rb vapor are registered. The absorption and fluorescence spectra in Rb vapors controlled by temperature and LIAD are compared.
We present in this paper recent results on Light - Induced Atom Desorption (LIAD) in sealed and open coated cells. LIAD is defined via the description of an experiment on rubidium atoms stored in a dry - film coated cell, where a few milliwatts of even non coherent and non resonant light are able to increase the alkali atomic density for more than one order of magnitude. Modeling of the effect is given. New features become relevant in the case of LIAD in porous glasses: in fact, although the photodesorption efficiency per unit area in bare glass is much lower, photoatomic sources can be prepared, due to the huge inner surface of porous samples. We applied LIAD from organic coatings to the stabilization of alkali densities out of equilibrium: sodium case is here discussed. Finally, we report on fully original, preliminary measurements of rubidium Magneto - Optical Trap loading via LIAD from a dry - film coated cell.
Light-induced atomic desorption (LIAD) is a non-thermal process in which atoms adsorbed at a surface are released under illumination. It is applied mostly to implementing optical dispensers in the cases when high atomic density at low temperature is needed – for example, for loading atomic devices as atomic magnetometers, atomic clocks, magneto-optical traps and their miniaturization. However, as the desorption depends on the atom-surface interaction, it can also be used for optical characterization and manipulation of alkali metal nanoparticles. The paper describes an experimental investigation of the shape of the transmission spectra and their dependence on the illuminating blue-light power in PDMS coated cells prepared with two different concentrations of PDMS in ether. A comparison is conducted with the LIAD effect in SC-77 coated and in uncoated cells. All measurements are performed on the Rb D2 line in vacuum. The potential is discussed for application of these dependences to analyzing the quality of the coating surface and its optimization.
In this work we present new features observed in the Saturated Absorption (SA) spectrum on the D1 line of K. In an uncoated optical glass cell containing pure K atoms, excitation by circularly polarized pump beam produces an enhancement of the amplitude of the crossover resonances due to the hyperfine transitions starting from the ground state Fg = 2. This effect appears to be much more relevant when K atoms are contained in a cell coated with an anti-relaxation film. Here, the crossover resonance in the Fg = 2 set of transition is not observed experimentally with linearly polarized pump light, while in case of circular polarization its amplitude is significantly enlarged. The Light Induced Atomic Desorption (LIAD) effect strongly improves the intensities of the SA resonances observed in coated cell.