Abstract
Internally amplified stimulated Raman scattering is developed as a novel approach to study concentrational thresholds in stimulated Raman scattering (SRS). In the proposed physical model, amplifier molecules are used to bridge the spatial gaps among analyte molecules distributed distantly from each other throughout a dilute solution. As a result, Stokes photons can more effectively reach the next target molecules down the pump light path to sustain and amplify the desirable SRS process. The model has been verified by experimental results which give a better understanding of the threshold phenomenon in SRS. The technique of internal amplification is practically useful to lower concentrational thresholds, leading to improved detection limits in analytical SRS measurements.
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