The sub-Doppler transmission spectrum in a thin vapour layer (about 150 μm) was observed at room temperature using the wavelength modulation technology. The absorption signal and its second-order harmonic were detected with an external-cavity diode laser. A sub-Doppler spectrum corresponding to resonant transitions of the caesium D 2 line (6S 1/2 →6P 3/2 ) was demonstrated. The dependence of the transmission signal on the intensity of the laser was also investigated.

Chinese PhysicsSep 1, 20040 citations

Journal of Applied Spectroscopy

Spectrum of Radiation Transmission by a Thin Layer of Resonant Atoms

V. A. Yurevich

Published Sep 1, 2000• 0 citations

Publisher

DOI: 10.1023/a:1004188405733

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L

of the atomic vapor layer in the range $\ensuremath{\sim}780--1600\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, for which

L

is comparable to the laser wavelength $\ensuremath{\lambda}$ resonant with the

{D}_{2}

line

(780\phantom{\rule{0.3em}{0ex}}\mathrm{nm})

. It is revealed that the transmission spectrum of the probe laser contains two sub-Doppler peaks that have different linewidths. The narrow peak corresponds to EIT, whereas the broader one results from velocity-selective optical pumping (VSOP) and repumping processes. It is demonstrated that in the case of nonzero detuning of the coupling laser, the EIT resonance and VSOP are shifted with respect to each other on the frequency scale, which makes it possible to observe a competition between the two effects (this is not possible to realize in an ordinary cell). Also, the Dicke-type coherent narrowing effect depending on the ratio $L∕\ensuremath{\lambda}$ influences the absorption spectrum of the probe laser. Formation of an EIT resonance is substantially favored for the atoms with slow normal velocity, caused by their longer interaction time with the bichromatic laser field. As a result of the predominant contribution of these atoms, the observed linewidth of the EIT resonance is only $\ensuremath{\sim}9\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$, which is more than ten times narrower than the inverse window-to-window flight time. In an external magnetic field, three and five EIT resonances have been observed for the vapor thickness of $L=2\ensuremath{\lambda}$, on

^{87}\mathrm{Rb}

and

^{85}\mathrm{Rb}

, respectively.