ATOM-WALL COLLISIONS INFLUENCE ON DARKLINE ATOMIC RESONANCES IN SUBMICRON THIN VAPOUR CELLS. - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2010

ATOM-WALL COLLISIONS INFLUENCE ON DARKLINE ATOMIC RESONANCES IN SUBMICRON THIN VAPOUR CELLS.

Résumé

Recently it was demonstrated that miniaturization of alkali cells, i.e. the use of an extremely thin cell (ETC) for the applications using the electromagnetically induced transparency (EIT) effect, despite to intuitive expectation, does not cause a strong broadening of the dark-line (DL) linewidth. Here we present the conditions when a strong broadening of DL linewidth (more than by 10 times) can be easily observed due to atom-wall collisions influence and this could be a convenient and robust tool for atomwall (i.e. ETC's window material/temperature) collisions study. We present experimental and theoretical results on EIT realized in a Λ- system of 85Rb, D2 line, 5S-5P-5S for a Rb vapour column with the thickness L ~ λ (λ = 780 nm) and varying in the range of (0.5 to 6) λ. Two cw diode-lasers (forming the coupling and probe beams) with the linewidths of 1 MHz are used. One of the striking results observed in ETC when the coupling is resonant with the atomic transition is that DL linewidth is weakly dependent on L and this allows us to detect DL at the smallest thickness reported up to now L = 0.5 λ = 390 nm. The explanation is that the contribution of atoms flying parallel to ETC windows is enhanced thanks to their longer interaction time with the laser field. Meanwhile, direct influence of atomwall collisions on DL linewidth is well seen when there is a large detuning Δ of the coupling from the resonant transition. DL linewidth achieves ~100 MHz for the case of Δ ~100 MHz and L ~ λ, meanwhile for the coupling to be resonant, it is < 9 MHz. We present EIT (DL) spectra for different L for the coupling detuned by Δ = 60 MHz from transition Fg =2 →3′ and the probe scanned across Fg=3 → 2′,3′,4′ transitions. In this case only atoms flying in the same direction with the laser radiation participate in the formation of DL and frequent collisions with the walls cause a strong DL broadening.
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Dates et versions

hal-00529720 , version 1 (26-10-2010)

Identifiants

  • HAL Id : hal-00529720 , version 1

Citer

A. Sargsyan, G. Hakhumyan, R. Mirzoyan, C. Leroy, Yevgenya Pashayan-Leroy, et al.. ATOM-WALL COLLISIONS INFLUENCE ON DARKLINE ATOMIC RESONANCES IN SUBMICRON THIN VAPOUR CELLS.. 10th European Conference on Atoms, Molecules and Photons : ecamp10, Jul 2010, Salamanca, Spain. ⟨hal-00529720⟩
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