Quasisteady State in the Stimulated Brillouin Scattering of Liquids

Abstract

Measurements of stimulated Brillouin scattering in C${\mathrm{S}}_2$, ethyl ether, and $n$-hexane with high time resolution (0.3 nsec) reveal a quasistationary state for most of the laser pulse. Conversion efficiencies between 70 and 90% were obtained. The linear relationship between Brillouin power and laser power, and the dependence of the conversion efficiency on the cell length, are in agreement with a stationary theory of stimulated Brillouin scattering. The steady-state gain factors were determined for three liquids and compared with values calculated from hypersonic data. The agreement between the theoretical and experimental gain factors is satisfactory.