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

Autor:	Robert L. Armstrong, Ronald G. Pinnick, T. E. Ruekgauer, J.-G. Xie
Rok vydání:	1993
Předmět:	Materials science Dye laser Scattering business.industry Laser pumping Atomic and Molecular Physics and Optics Rhodamine Rhodamine 6G symbols.namesake chemistry.chemical_compound Optics chemistry symbols Particle business Lasing threshold Raman scattering
Zdroj:	Optics Letters. 18:340
ISSN:	1539-4794 0146-9592
DOI:	10.1364/ol.18.000340
Popis:	Stimulated Raman scattering (SRS) in laser-irradiated microdroplets is suppressed by the addition of nanometer-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 of 50 < d < 500 nm. SRS emission occurs at droplet morphology-dependent resonances (MDR’s) after either direct pumping by the incident 532-nm laser or indirectly whereby the pump laser first initiates dye lasing, which in turn pumps SRS. 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 ~1 particle must occupy the MDR mode volume at threshold, whereas for small latex the addition of particles facilitates Forster-assisted annihilation of both 532-nm and dye-lasing MDR pump photons.
Databáze:	OpenAIRE
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