Study on parameters and performances of SBS medium C4Cl6

The stimulated Brillouin scattering (SBS) medium hexachlorobuta-1,3-diene (C4Cl6) with little absorption coefficient is studied in terms of the absorption theory of medium to the light. Through basic physical parameters, the SBS parameters of C4Cl6 with the incident beam wavelength of 1 064 nm are determined. The absorption coefficient is 0.003 cm-1, the phonon lifetime is 0.25 ns and the gain coefficient is 4.9 cm·GW-1. Whereas the Brillouin frequency is inversely proportional to the incident beam wavelength and the phonon is proportional to its square, the gain coefficient is wavelength-independent. In the single-cell SBS system pumped by Nd:YAG Q-switched laser, the SBS performances of C4Cl6 are studied. The results show that the saturation energy reflectivity of C4Cl6 is above 55%, we