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Optica Acta International Journal of Optics

Up-conversion Using Stimulated Anti-stokes Raman Scattering and Stimulated Collisional Induced Fluorescence in Tl

D. G. Cunningham, Donal J. Denvir, I. Duncan, Thomas Morrow

Published Mar 1, 1984• 3 citations
Publisher

Abstract

We have observed stimulated collisional induced fluorescence at 377·6 nm in a Tl anti-Stokes Raman up-converter. The up-converter was operated with an excess pressure of argon, and the influence of the ‘collisional’ pumping of the Tl (72S½) level on both the anti-Stokes Raman and collision-induced fluorescence was investigated.
DOI
10.1080/09670269600651451

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We have observed collisional redistribution of laser light scattered by a three-level atom, thallium, in the presence of argon. The two observed spectral components correspond to Raman scattering and collision-induced fluorescence. We have seen the growth of both components from spontaneous to stimulated scattering as the laser intensity is increased. While the gain for the Raman component agrees with theory, the observed gain of the collision-induced fluorescence is over an order of magnitude lower than predicted.
The stimulated collision-induced fluorescence (SOF) at wavelengths of 472.6nm, 582.6nm and 648.3nm, as well as Raman-shifted radiation at wavelength of 475nm were observed in barium vapor pumped by broadband pulse of the XeOl laser. The SCF was found to be self-termination short pulses with FWHM of 8 ns, and its internsity inoreased with buffer-gas pressure. There existed time delay aa long as 20 ns between the front edges of the pump pulse and of the Raman-shifted pulse, and the Raman conversion efficiency decreased significantly as the buffer-gas pressure increasing.