Suppression of stimulated Raman scattering from microdroplets by seeding with nm-sized latex particles

J.-G. Xie; Thomas E. Ruekgauer; Robert L. Armstrong; Ronald G. Pinnick

doi:10.1117/12.145700

24 May 1993 Suppression of stimulated Raman scattering from microdroplets by seeding with nm-sized latex particles

J.-G. Xie, Thomas E. Ruekgauer, Robert L. Armstrong, Ronald G. Pinnick

Proceedings Volume 1862, Laser Applications in Combustion and Combustion Diagnostics; (1993) https://doi.org/10.1117/12.145700
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

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.

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J.-G. Xie, Thomas E. Ruekgauer, Robert L. Armstrong, and Ronald G. Pinnick "Suppression of stimulated Raman scattering from microdroplets by seeding with nm-sized latex particles", Proc. SPIE 1862, Laser Applications in Combustion and Combustion Diagnostics, (24 May 1993); https://doi.org/10.1117/12.145700

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KEYWORDS

Latex

Bioalcohols

Particles

Atmospheric particles

Scattering

Laser damage threshold

Raman scattering

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