Abstract

Common liquid Brillouin media have poor optical and physical stability when they are pumped at high average powers. We demonstrate that tin tetrachloride, SnCl₄, is stable and shows no thermal defocusing at 1064 nm for 20-ns pulses at fluences of 3 J/cm² and a pulse-repetition frequency of 10 Hz. To characterize this new stimulated-Brillouin-scattering medium we measured the following stimulated Brillouin parameters: Brillouin shift at 35°C, ν_B = (2.21 ± 0.02) GHz or ω_B = 7.37 × 10⁻² cm⁻¹; temperature dependence of the Brillouin shift, dν_B/dT = −8.95 MHz/°C; small-signal gain coefficient at line center, g₀ = (11.2 ± 0.5) cm/GW; Brillouin-gain linewidth, Δν_B = (182 ± 12) MHz, which corresponds to a phonon relaxation time τ_B = 1.75 ns; and refractive index n = 1.36 at 1.064 μm and 25°C.

© 1991 Optical Society of America

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