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Optics and Spectroscopy

Broadening of the lambda =589.0-nm Na i resonance line in collisions with dipolar molecules

K. G. Popov, V. P. Ruzov, Yu.A. Salganik, Viktor N. Sivkov

Published Jan 1, 1979• 0 citations
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Lasing on the D lines of sodium pumped by free→free transitions of Na-Xe collision pairs

J. Darby Hewitt, James Gary Eden

Lasing on the D1 and D2 lines of Na (589.6 and 589.0 nm, respectively) has been generated simultaneously by photoexciting free→free transitions of thermal Na-Xe collision pairs. Pumping the blue satellite of the Na D2 line in Na/Xe mixtures (λ ≈ 560 nm) selectively interacts with Na-Xe pairs having an instantaneous internuclear separation of ∼5 Å and culminates in the population of both Na (32PJ) fine structure levels. The spectral width of the laser excitation spectrum is 1.3 nm (centered at 560.1 nm) and the 32P3/2→32S1/2 (D2) laser linewidth was measured to be 9.2 ± 0.6 GHz, which is consistent with a coefficient of 18.4 MHz/Torr for broadening of the D2 589.0 nm transition by Xe.

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Absorption of powerful resonance radiation accompanying collisional line broadening

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ATOM-WALL COLLISIONS INFLUENCE ON DARK-LINE ATOMIC RESONANCES IN SUBMICRON THIN VAPOUR CELLS

Armen D. Sargsyan, G. Hakhumyan, R. Mirzoyan +3 more

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.

•Jul 4, 2010•0 citations

Resonance broadening of 794.7- and 780.0-nm Rb i line

P. Kantor, А. В. Мохов, N. P. Penkin +1 more

Optics and Spectroscopy•Jun 1, 1985•0 citations
Lasing on the D1 and D2 lines of Na (589.6 and 589.0 nm, respectively) has been generated simultaneously by photoexciting free→free transitions of thermal Na-Xe collision pairs. Pumping the blue satellite of the Na D2 line in Na/Xe mixtures (λ ≈ 560 nm) selectively interacts with Na-Xe pairs having an instantaneous internuclear separation of ∼5 Å and culminates in the population of both Na (32PJ) fine structure levels. The spectral width of the laser excitation spectrum is 1.3 nm (centered at 560.1 nm) and the 32P3/2→32S1/2 (D2) laser linewidth was measured to be 9.2 ± 0.6 GHz, which is consistent with a coefficient of 18.4 MHz/Torr for broadening of the D2 589.0 nm transition by Xe.
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.