NDLI: High-resolution roughness measurements using cold atom reflection

Content Provider	IEEE Xplore Digital Library
Author	Savalli, V. Featonby, P.D. Josse, V. Cognet, L. Stevens, D. Westbrook, N. Westbrook, C.I. Aspect, A.
Copyright Year	2000
Description	Author affiliation: Lab. Charles Fabry, Inst. d'Opt., Orsay, France (Savalli, V.; Featonby, P.D.; Josse, V.; Cognet, L.; Stevens, D.; Westbrook, N.; Westbrook, C.I.; Aspect, A.)
Abstract	Evanescent wave atomic mirrors have been shown to be very sensitive to the surface roughness of the glass substrate on which the evanescent wave is formed. Non-specular reflection of slow atoms at normal incidence has been observed for surface roughness as low as 0.1 nm. We interpret this behaviour in terms of diffraction of the atomic De Broglie wave on the modulated potential created by the interference of the evanescent wave with light scattered by the rough surface. However these experiments could not separate the specular peak of reflected atoms from the diffuse part. We have developed a new method to measure the velocity distribution of the atoms after the bounce with a much better resolution, using Raman transitions. Two phase locked counterpropagating laser beams induce a Raman transition between the ground state hyperfine levels of the /sup 85/Rb atoms falling from a magneto-optical trap. The resonance condition is only fulfilled for atoms with a transverse velocity controlled by the interaction time between the atoms and the beams. These velocity selected atoms bounce on the mirror and their velocity distribution after reflection can be measured using the same Raman beams, by scanning their difference in frequency.
File Size	64090
File Format	PDF
ISBN	0780363183
DOI	10.1109/IQEC.2000.908139
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-09-10
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Atomic measurements Atomic beams Optical reflection Rough surfaces Surface roughness Mirrors Surface waves Velocity measurement Laser beams Glass
Content Type	Text
Resource Type	Article

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