RESONANT SEEDING OF STIMULATED BRILLOUIN-SCATTERING BY CROSSING LASER-BEAMS

This Letter presents the first experimental evidence of seeding of ion acoustic waves (IAW) from stimulated Brillouin scattering along the r esonant direction between two interaction beams. Using a secondary int eraction beam at a reduced intensity acting as seed, a well defined re sonance was observed along the bisecting direction between the two las er beams. A strong reduction of the IAW was observed along off-resonan ce directions, including for backscatter of the primary beam.