Coherent population trapping effect in sub-micron thin Rb-vapor layer.

Y. Pashayan-Leroy, David G. Sarkisyan, Armen D. Sargsyan +2 more

Armen D. Sargsyan, David G. Sarkisyan

Miao Zhu, Leonard S. Cutler, J.E. Berberian +3 more

We report our measurement of coherent-population-trapping (CPT) signal linewidths in small vapor cells, which are desirable for chip scale atomic clock (CSAC) applications. The linewidths are measured in both rubidium vapor cells and cesium vapor cells. Using a micro-machined silicon absorption cell (diameter = 1.7 mm, length = 2 mm), we demonstrate a sub-kHz linewidth (FWHM) of the clock transition in the /sup 133/Cs atom (|F = 3, m/sub F/ = 0>/spl harr/|F = 4, m/sub F/ = 0>). The measured intrinsic linewidths (FWHM = 777 Hz for Cs and FWHM = 1496 Hz for Rb) of the cells agree with the calculated results.

Hyun Joon Lee, Han Seb Moon

We investigated the switching between the transmittance and absorption of the 5S1/2(F=2)→5P1/2(F′=1) transition of Rb87 in a paraffin-coated Rb vapor cell in the Hanle configuration. When the laser polarization was changed from linear to circular, the coherent population trapping (CPT) spectrum, with a spectral width of 0.12 mG due to the Ramsey effect, transformed into a narrow absorption spectrum with a sub-milligauss spectral width of 0.2 mG. The CPT and narrow absorption spectra were numerically calculated for both polarizations by considering the degenerate magnetic sublevels of the 5S1/2–5P1/2 transition in the antirelaxation-coated atomic vapor cell. This narrow absorption spectrum was revealed to be magnetic-field-induced absorption due to the residual transverse magnetic field and preservation time of the ground-state coherent spin states.

S. Balushev, Norbert Leinfellner, Eugeny Korsunsky +1 more