Beschreibung:
<jats:p>Forward stimulated Brillouin scattering characteristics are formulated by an extension of the current theory. Angle-dependent gain functions are derived in collimated and focused pump geometries. The time of growth for forward scattering based on the derived gain functions is calculated by comparing the forward and backward intensity time scales. The forward intensity is shown to grow in times on the order of thousands of phonon lifetimes and its behavior is that of an expanding cone reaching a maximum angle varying inversely as the square root of the pump f number.</jats:p>