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Physical Review Applied

Light-Induced Atomic Desorption in Microfabricated Vapor Cells for Demonstrating Quantum Optical Applications

Eliran Talker, Pankaj Arora, Roy Zektzer, Yoel Sebbag, Mark Dikopoltsev, Uriel Levy

Published May 6, 2021• 18 citations
Publisher

Abstract

In the quest to employ miniaturized atomic vapor cells for quantum applications, unfortunately such a short optical path is insufficient to obtain a decent signal that can be used to lock a laser. Heating up the cell would work, but at the price of undesired currents and linewidth broadening. Instead, the authors use light-induced atomic desorption (LIAD) to increase the atomic (and optical) density. Using LIAD yields a much larger contrast than does conventional spectroscopy---even at room temperature. Furthermore, eliminating the need for heating allow remote operation, without the need to provide electrical contacts to the device, which can be an important advantage in applications.

DOI
10.1103/physrevapplied.15.l051001

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In the quest to employ miniaturized atomic vapor cells for quantum applications, unfortunately such a short optical path is insufficient to obtain a decent signal that can be used to lock a laser. Heating up the cell would work, but at the price of undesired currents and linewidth broadening. Instead, the authors use light-induced atomic desorption (LIAD) to increase the atomic (and optical) density. Using LIAD yields a much larger contrast than does conventional spectroscopy---even at room temperature. Furthermore, eliminating the need for heating allow remote operation, without the need to provide electrical contacts to the device, which can be an important advantage in applications.
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.
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.
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.