Coupling competition and energy transfer between C=C and C–H vibration in the process of cascaded stimulated Raman scattering of benzene–methanol solution

We introduced the coupling competition and energy transfer between the C=C and C–H vibration modes in the process of cascaded stimulated Raman scattering (SRS) of benzene and methanol mixtures. The results show that when the molar fraction of methanol is 0.9, the SRS process related to Raman activity can be simultaneously induced in different molecules, and the SRS gains involving a common pump pulse are coupled and compete. Two new peaks (992 + 2839) and (992 + 2945) cm−1 appeared, which are attributed to the energy transfer between the C=C ring vibration and the –CH3 stretching vibration. The interaction between adjacent vibrations can produce strong Raman scattering and achieve efficient wavelength conversion, which may provide a simple method for realizing multi-wavelength laser sources.