NATURE OF INTENSITY AND PHASE MODULATIONS IN STIMULATED BRILLOUIN-SCATTERING

The nature of stimulated Brillouin scattering (SBS) temporal modulatio ns for a focused beam in a finite-length cell with homogeneous medium is examined numerically. The finite phonon lifetime produces determini stic oscillations at the threshold while the inclusion of the random n oise as an initiation source of SBS leads to stochastic fluctuations i n Stokes intensity and phase. A unified study of both modulations unde r different parameters is presented. The results indicate a large usef ul parameter space for excellent Stokes beam quality.