124 research outputs found
Study of EIT resonances in an anti-relaxation coated Rb vapor cell
We demonstrate---experimentally and theoretically---that resonances obtained
in electromagnetically induced transparency (EIT) can be both bright and dark.
The experiments are done using magnetic sublevels of a hyperfine transition in
the D line of Rb. The degeneracy of the sublevels is removed by
having a magnetic field of value 27 G. The atoms are contained in a
room-temperature vapor cell with anti-relaxation coating on the walls.
Theoretical analysis based on a two-region model reproduces the experimental
spectrum quite well. This ability to have both bright and dark resonances
promises applications in sub- and super-luminal propagation of light, and
sensitive magnetometry.Comment: 16 pages, 9 figure
Selective reflection spectroscopy of a vapour at a calcium fluoride interface
Fluoride materials exhibit surface resonances located in the thermal
infrared. This makes them interesting to search for a fundamental temperature
dependence of the atom-surface interaction, originating in the near-field
thermal emissivity of the surface. Preliminary selective reflection experiments
performed on a special Cs vapour cell that includes a CaF2 interface show a
temperature dependence, yet to be analyzedComment: selected to appear in Annales de Physique- COLOQ 1
Hyperfine Paschen-Back regime realized in Rb nanocell
A simple and efficient scheme based on one-dimensional nanometric thin cell
filled with Rb and strong permanent ring magnets allowed direct observation of
hyperfine Paschen-Back regime on D1 line in 0.5 - 0.7 T magnetic field.
Experimental results are perfectly consistent with the theory. In particular,
with sigma+ laser excitation, the slopes of B-field dependence of frequency
shift for all the 10 individual transitions of 85,87Rb are the same and equal
to 18.6 MHz/mT. Possible applications for magnetometry with submicron spatial
resolution and tunable atomic frequency references are discussed.Comment: 3 page
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