Enhancement CH-SRS of benzene mixing with toluene in liquid-core optical fiber at a low excitation power

Stimulated Raman scattering (SRS) of benzene mixing with toluene is studied in liquid-core optical fiber (LCOF) at a low excitation power 3 mJ/pulse. We obtained the intensive SRS of CH stretching vibration at 3060 cm−1 [CH-SRS]. Neat benzene or toluene does not show the CH-SRS line under the same experimental condition. The CH-SRS threshold at 3060 cm−1 for the binary solution was 2.5 mJ/pulse. The results suggest that interaction in molecular vibrations can generate strong CH-SRS in LCOF, we assume that the main mechanism of these phenomena to be the laser-induced plasma (LIP) enhancement to CH-SRS, which may provide a simple way to investigate the intermolecular interaction.