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Journal of Physics B Atomic and Molecular Physics

Stimulated Stokes and anti-Stokes electronic Raman scattering by selectively excited potassium and rubidium atoms

Daniel Joseph Bradley, G. M. Gale, P D Smith

Published Oct 1, 1971• 13 citations
Publisher

Abstract

Simultaneous Stokes and anti-Stokes electronic Raman scattering has been obtained between the resonance doublets of potassium and rubidium atoms selectively excited by a frequency tunable dye laser. New Raman scattering components near the resonance lines have been observed with rubidium in the presence of helium.
DOI
10.1088/0022-3700/4/10/020

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A report is given of the first quantitative study of the spontaneous and stimulated electronic Raman scattering by a resonance doublet of the sodium atom excited resonantly at the D 1 and D 2 lines by a tunable dye laser. Theoretical and experimental analyses of the differential scattering cross section and polarization properties at the Stokes and anti-Stokes frequencies show that the observed scattering is due to a nearly resonant process involving the ground state 3 S 1/2 as the dominant intermediate state. The stimulated Stokes and anti-Stokes scattering lines, which are shifted from the D 1 and D 2 lines by an amount corresponding to the frequency separation between lowest-lying excited doublets 3 P 1/2 and 3 P 3/2 , are observed by exciting a sodium vapor cell with a passively mode-locked dye laser.
Nonresonant stimulated anti-Stokes Raman scattering from an inverted population in atomic iodine has been observed. The population inversion was achieved by flash photolysis of trifluoromethyliodide. A gain of e7{e}^{7}e7 was measured for a laser probe pulse at the anti-Stokes wavelength passing through the inverted iodine coincident with a laser pump pulse. This result is in good agreement with theoretical predictions.
Experiments are reported in which a pulsed dye-laser beam nu L was focused into a heat-pipe oven containing caesium vapour at densities of about 10 17 cm -3 . Optically pumped fixed-frequency infra-red laser emission nu IR and tunable stimulated electronic Raman-scattered radiation nu S were observed. In addition the generation of ultra-violet radiation by coherent anti-Stokes Raman scattering nu UV = nu L - nu S + nu IR was detected. Focused-beam phase matching appears to play a significant role in this process.