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Regularities of stimulated Raman scattering of dyes in a multiple scattering media

ABSTRACT The main regularities influencing stimulated Raman scattering (SRS) occurrence of laser dyes in effective multiple scattering media (vesicular polymeric films) were studied on rhodamine series (R6G, R575, RB and R110) and summarized. It is shown that SRS interact closely with random lasing (RL) of dye what determines its behavior and causes appearance of all Stokes lines within RL spectrum. These effects forms coupled SRS-RL phenomenon. For its occurrence two resonances must be provided: pumping and RL radiation (as two component pump) with dye molecule vibration and pumping radiation with the electronic transition of dye molecule. Both resonances are realized if RL spectrum matches with spectral range of Stokes lines. This matching may be control with “pseudo-Stokes” spectrum constructed with vibration frequencies revealing in IR absorption spectrum of dye. The matching may be achieved by change of dye concentration and frequency of pumping radiation. The best SRS-RL occurrence realizes when the optimal matching achieves at highest dye concentration. The obtained data may by useful for development of Raman spectroscopy for laser dyes.