Title :
Determination of the threshold for instability in four-wave mixing mediated by Brillouin scattering
Author :
Watkins, D.E. ; Scott, Andrew M. ; Ridley, Kevin D.
Author_Institution :
R. Signals & Radar Establ., Malvern, UK
fDate :
12/1/1990 12:00:00 AM
Abstract :
The threshold for instability in Brillouin-enhanced four-wave mixing has been experimentally determined as a function of both the phase mismatch and the ratio of the pump beam intensities and is shown to agree with theoretical modeling. The effective input noise intensity for four-wave mixing in the unstable regime is compared to the noise in a stimulated Brillouin scattering amplifier and is found to be higher by a factor of three in the forward direction. Competition between two input signals has been investigated, and it is shown that the signal which arrives first dominates the interaction in the unstable regime
Keywords :
multiwave mixing; noise; optical materials; optical pumping; stimulated Brillouin scattering; Brillouin scattering; Brillouin-enhanced four-wave mixing; SBS medium; input noise intensity; instability thresholds; phase mismatch; pump beam intensities; stimulated Brillouin scattering; unstable regime; Acoustic beams; Acoustic noise; Acoustic scattering; Acoustic waves; Brillouin scattering; Four-wave mixing; Interference; Laser excitation; Radar scattering; Reflectivity;
Journal_Title :
Quantum Electronics, IEEE Journal of
