Abstract
A novel technique for the identification of the chemical composition of microdroplets has been developed. External seeding of stimulated Stokes Raman scattering (SSRS) has been applied to reduce the minimum detectable concentration of the minority species in multicomponent microdroplets. To avoid complications with polarizer and analyzer in remote sensing applications, we utilize the fact that the probed (seeded) SSRS band of the minority species (at νmin) can efficiently pump SSRS of the majority species (at νmaj). The Raman signal of the minority species appears at a shift of νmin+maj, which can easily be distinguished from the elastically scattered light of the seed laser at the shift of νmin. Furthermore, we investigated fluorescing microdroplets with stimulated anti-stokes Raman scattering (SARS).
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