Line width compression and temporal coherence of stimulated Brillouin scattering

Abstract

The effect of line width compression of stimulated Brillouin scattering (SBS) is investigated experimentally. It is found that the line width compression is directly related to the compression of pulse duration. A new method of measuring the line width of SBS through measuring the pulse duration is proposed. The temporal coherence of SBS is also investigated. It is revealed that the temporal coherence of SBS varies with the compression ratio of pulse duration. High pulse duration compression and good temporal coherence cannot be obtained simultaneously.

Stokes linewidth narrowing by stimulated Brillouin scattering in liquid media

“…In the low-gain limit, the Stokes spectrum exhibits a Lorentzian shape with a linewidth of , w D = G which is characteristic of spontaneous Brillouin scattering. In the high-gain limit, the Stokes spectrum exhibits a Gaussian shape, and the linewidth becomes: 28) However, this approach based on the temperature-dependent characteristic of Brillouin gain linewidth Γ has a limited application owing to thermal accumulation in the medium.…”