Enhancement of stimulated Raman scattering of minority species of binary mixture in pendant drops by dye lasing gain

Abstract

The enhancement of stimulated Raman scattering (SRS) of minority species of binary mixture is demonstrated in pendant drops by overlapping the Stokes wavelengths of the Raman modes of minority species with Rhodamine 640 dye lasing gain.The limit of detectable concentration for the minority species,methanol in methanol-ethanol and ethanol in ethanol-water mixtures,is greatly reduced. Based on the theory of SRS,the mechanism for enhancing SRS of minority species is explained.