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Europhysics Letters (EPL)

Observation of 3D Light-Induced Drift in a Spherical Cell

Silvia Gozzini, D. Zuppini, C. Gabbanini, L. Moi

Published Feb 1, 1990• 3 citations
Publisher

Abstract

Light-induced drift has been observed in a silane-coated spherical cell containing sodium vapour and a few Torr of krypton as a buffer gas. The cell is illuminated by six laser beams, orthogonal to each other, obtained from a broad-band dye laser having a long-cavity configuration. A compression of the vapour at the centre of the cell has been obtained which would permit the realization of wall interaction-free experiments.

DOI
10.1209/0295-5075/11/3/004

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Light-induced drift has been observed in a silane-coated spherical cell containing sodium vapour and a few Torr of krypton as a buffer gas. The cell is illuminated by six laser beams, orthogonal to each other, obtained from a broad-band dye laser having a long-cavity configuration. A compression of the vapour at the centre of the cell has been obtained which would permit the realization of wall interaction-free experiments.
The resonance-radiation-pressure effect induced by a broadband long-cavity dye laser has been observed on sodium vapor confined in a capillary cell. The diffusion of the vapor has been studied as a function of laser intensity and vapor density, and the induced drift velocity has been measured. The time evolution of the vapor density is in agreement with the theoretical model under the hypothesis of optimized laser-vapor coupling. The drift velocity and the diffusion coefficient are shown instead to be larger than predicted, indicating an incomplete thermalization of the atoms at the cell walls.