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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Light-induced atomic desorption dynamics in cells with different coatings

S. Tsvetkov, Marian A. Taslakov, E. Mariotti, S. Gateva

Published Jan 8, 2015• 0 citations
Publisher

Abstract

The dynamics of Light-Induced Atomic Desorption (LIAD) in 6 cells with different coatings (PDMS coated cells prepared with two different concentrations of PDMS in ether, SC-77, PCHS, DCDMS, OTS) is investigated. The rates of desorption and adsorption of the Rb atoms when the illuminating light is switched ON and OFF and their dependence on the illuminating blue-light power are measured. The influence of the homogeneity of illumination for increasing the desorption and adsorption rates is evaluated. The results are interesting for the better understanding of LIAD and its dynamics and for the development of new optoelectronic elements, LIAD-loaded atomic devices and their miniaturization, and new methods for surface and coating diagnostics.

DOI
10.1117/12.2177574

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Bulgarian Chemical Communications•Jan 1, 2016•0 citations
The dynamics of Light-Induced Atomic Desorption (LIAD) in 6 cells with different coatings (PDMS coated cells prepared with two different concentrations of PDMS in ether, SC-77, PCHS, DCDMS, OTS) is investigated. The rates of desorption and adsorption of the Rb atoms when the illuminating light is switched ON and OFF and their dependence on the illuminating blue-light power are measured. The influence of the homogeneity of illumination for increasing the desorption and adsorption rates is evaluated. The results are interesting for the better understanding of LIAD and its dynamics and for the development of new optoelectronic elements, LIAD-loaded atomic devices and their miniaturization, and new methods for surface and coating diagnostics.
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.
We studied the light-induced atomic desorption (LIAD) at different geometries and homogeneities of cell illumination. An original system for homogeneous illumination of the cells was developed and the Rb D2 line absorption spectra in several uncoated and coated cells were compared without illumination, with single-side illumination and with homogeneous illumination. The transmission as a function of the illumination intensity and the tuning direction was measured. The absorption coefficients with and without illumination of the stem were compared. The system developed for homogeneous illumination increases the efficiency of the LIAD, enables the investigation of LIAD without lateral diffusion, prevents cluster formation and reduces the influence of the stem. A good knowledge of the factors influencing the alkali atom spectra will be useful not only for the development of new LIAD-loaded atomic devices and their miniaturization, but also for the study of atom-dielectric surface interactions and the development of new all-optical methods for surface and coating diagnostics.
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 observe Light-induced atomic desorption (LIAD) of Rb and Cs atoms from a PDMS-coated cell containing both atoms at the same time. The desorption rate and the relative vapor density variation have been simultaneously measured for both alkali atoms as a function of the desorbing light intensity and frequency. They show the same behaviour upon the different illumination conditions. This work demonstrates the possibility to provide light controlled atomic dispenser delivering different atomic species using the LIAD effect.
Optical characterization of antirelaxation coatings with regard to their applications in coherent spectroscopy and LIAD experiments is presented. A simple method, based on the recording of the fluorescence intensity of the Rb alkali atoms during resonant light pulse irradiation is used for comparison of the antirelaxation properties of the coatings. The LIAD yield and dynamics are measured by registration of the 780 nm Rb line transmission. The comparison of the parameters of PDMS coatings prepared with two different solutions in ether (PDMS 2% and PDMS 5%) shows that when illuminating with such LED intensity at which the LIAD efficiency is equal in the two cells, the light induced Rb vapor density changes are about an order of magnitude slower in the PDMS 2% cell, and the antirelaxation properties of the two cells are equal.