Detection of Minority Species in Microdroplets: Enhancement of Stimulated Raman Scattering

Alfred S. Kwok and Richard K. Chang

Spontaneous Raman scattering has served as a useful spectroscopic technique since its discovery. However, the weak signal prevents its application in dynamic environments. Moreover, the Raman spectrum can be overwhelmed by fluorescence from even trace impurities. Stimulated Raman scattering (SRS) is intense, but a minimum sample length is needed to provide the Raman gain. SRS is useful only in detecting majority species because of depletion of the pump laser by the SRS from the strongest-gain Raman mode.

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