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- W1522735796 abstract "The dynamical behavior of stimulated Brillouinscattering (SBS) under a variety of conditions is investigated boththeoretically and experimentally. Under conditions of a singlecontinuous-wave laser field, the initiation of the SBS process istreated by including the thermal fluctuations of the materialdensity which lead to spontaneous Brillouin scattering. Predictionsare made for the threshold of SBS, for the output Stokes spectrum,and for the temporal behavior of the Stokes light. The spectrum ofthe output Stokes light is predicted to exhibit gain-narrowing asthe input laser intensity is increased. Under certain conditions,the Stokes output intensity is expected to exhibit nearly 100%fluctuations even far above the threshold for SBS. Experimentsperformed in a single-mode optical fiber verify many of thepredictions of the theory. Due to the highgain that can be achieved for the Stokes wave, a small amount offeedback from both interfaces of the interaction region is found todramatically modify the characteristics of the output Stokes light.The system is found to undergo a transition from stochastic todeterministic behavior. Theoretical analysis demonstrates that thethreshold for Brillouin oscillation can be much lower than thethreshold for single-beam SBS, and the spectrum is shown to benearly monochromatic. The temporal behavior of the Stokes lightabove threshold is found to exhibit both stable and periodicoutput. Experiments utilizing a single-mode optical fiber withfeedback from the endfaces confirmed many of the theoreticalpredictions. Stimulated Brillouin scattering in the presence of twocounter-propagating laser beams is studied. Under these conditions,the laser beams become temporally unstable to the growth of Stokesand anti-Stokes light. For the case when the input intensities ofthe two waves are comparable, the threshold for instability can besignificantly lower than the threshold for usual single-beam SBSand, for the case of a broad Brillouin line, the system can show aperiod-doubling route to chaos. This Brillouin instability wasobserved experimentally using carbon disulfide as theBrillouin-active material." @default.
- W1522735796 created "2016-06-24" @default.
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- W1522735796 date "1990-10-01" @default.
- W1522735796 modified "2023-09-26" @default.
- W1522735796 title "Stochastic and deterministic fluctuations in stimulated Brillouin scattering" @default.
- W1522735796 hasPublicationYear "1990" @default.
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