Continuous wave stimulated Raman scattering of benzene by fluorescence enhancement in hollow fused silica fiber



We present continuous wave stimulated Raman scattering (SRS) of benzene (C6H6) influenced by the fluorescent dye m-cresol purple in a hollow fused silica fiber (HFSF). Because of the transmission loss of the HFSF filled with C6H6, the SRS occurs when the Stokes gain equals the transmission loss, with the loss taken at the Stokes wavelength. The 992 cm−1 stimulated Stokes line has been obtained at the pump wavelength 658 nm, which cannot be obtained at 532 nm because the Stokes wavelength (562 nm) does not locate in the transmission loss. Also, the pump power is 35 mW with m-cresol purple which is much lower than 800 mW without the dye. The profile of the 992 cm−1 stimulated Stokes is changed, and the weak shoulders of the profile are amplified by fluorescence. These results are expected to be of relevance in applications on the tunable Raman laser at new wavelengths. Copyright © 2011 John Wiley & Sons, Ltd.