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Proceedings Paper

Suppression of stimulated Raman scattering from microdroplets by seeding with nm-sized latex particles
Author(s): J.-G. Xie; Thomas E. Ruekgauer; Robert L. Armstrong; Ronald G. Pinnick
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Paper Abstract

Stimulated Raman scattering (SRS) in laser-irradiated microdroplets is suppressed by the addition of nm-sized latex particles. The microdroplets consist of either pure ethanol or a solution of Rhodamine 6G dye in ethanol, seeded with latex particles having diameters 50 < d < 500 nm. SRS emission occurs at droplet morphology-dependent-resonances (MDR's) following either direct pumping by the incident 532 nm laser, or indirectly whereby the pump laser first initiates dye lasing which in turn pumps SRS. It is noteworthy that no Raman emission is observed from the corresponding bulk sample. For large latex, we observe SRS suppression at a near-coincident threshold concentration independent of the presence of dye; whereas, for small latex, adding dye reduces the threshold concentration by more than an order of magnitude. These findings are consistent with the interpretation that, for large latex, approximately 1 particle much occupy the MDR mode volume at threshold while for small latex, the addition of particles facilitates Forster-assisted annihilation of both 532 nm- and dye lasing MDR-pump photons.

Paper Details

Date Published: 24 May 1993
PDF: 6 pages
Proc. SPIE 1862, Laser Applications in Combustion and Combustion Diagnostics, (24 May 1993); doi: 10.1117/12.145700
Show Author Affiliations
J.-G. Xie, New Mexico State Univ. (United States)
Thomas E. Ruekgauer, New Mexico State Univ. (United States)
Robert L. Armstrong, New Mexico State Univ. (United States)
Ronald G. Pinnick, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 1862:
Laser Applications in Combustion and Combustion Diagnostics
Larry C. Liou, Editor(s)

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