9 research outputs found
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
Magnetic field--induced modification of selection rules for Rb D line monitored by selective reflection from a vapor nanocell
Magnetic field-induced giant modification of the probabilities of five
transitions of of Rb and
three transitions of of Rb
forbidden by selection rules for zero magnetic field has been observed
experimentally and described theoretically for the first time. For the case of
excitation with circularly-polarized () laser radiation, the
probability of transition becomes
the largest among the seventeen transitions of Rb group, and the probability of transition becomes the largest among the nine transitions of
Rb group, in a wide range of magnetic
field 200 -- 1000 G. Complete frequency separation of individual Zeeman
components was obtained by implementation of derivative selective reflection
technique with a 300 nm-thick nanocell filled with Rb, allowing formation of
narrow optical resonances. Possible applications are addressed. The theoretical
model is perfectly consistent with the experimental results.Comment: 6 pages, 5 figure
Essential features of optical processes in neon-buffered submicron-thin Rb vapor cell
International audienceA new submicron thin cell (STC) filled with Rb and neon gas is developed and comparison of resonant absorption with STC containing pure Rb is provided. The effect of collapse and revival of Dicke-type narrowing is still observable for the thickness L = λ /2 and L = λ , where λ is a resonant laser wavelength 794 nm (D1 line). For an ordinary Rb cm-size cell with addition of buffer gas, the velocity selective optical pumping/saturation (VSOP) resonances in saturated absorption spectra are fully suppressed if neon pressure > 0.5 Torr. A spectacular difference is that for L = λ , VSOP resonances are still observable even when neon pressure is ≥ 6 Torr. Narrow fluorescence spectra at L = λ /2 allow one to realize online buffer gas pressure monitoring. A good agreement with theoretical model is observed