Enhancement of stimulated Raman scattering of a weak vibration mode in tetrahydrofuran through the energy-transfer resonance of lycopene

Abstract

A method of energy-transfer resonance of lycopene used to enhance stimulated Raman scattering (SRS) of a weak vibration C–O mode in tetrahydrofuran (THF) was developed in this study. Only C–H SRS was observed in pure THF at high energies. When lycopene was added, the C–O SRS located at 915 cm−1 of the weak vibration mode in THF was observed. The maximum SRS enhancement of the C–O mode was achieved when the concentration was 3.72 × 10−6 mol/L because of the resonance enhancement of the solute, which transferred the excess vibrational energy to the solvent. Moreover, the pulse width compression phenomenon of the C–H vibration in the presence of C–O SRS was obtained.