Abstract

We investigated the switching between the transmittance and absorption of the $5{\mathrm{S}}_{1/2}(F=2)\to 5{\mathrm{P}}_{1/2}(F^{\prime }=1)$ transition of ${}^{87}\mathrm{Rb}$ 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 $5{\mathrm{S}}_{1/2}–5{\mathrm{P}}_{1/2}$ 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.

© 2013 Optical Society of America

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