Abstract
A new mechanism for passive Q-switching in fiber lasers based on cooperative dynamics of linear Rayleigh backscattering (RS) and Stimulated Brillouin Scattering (SBS) has been reported1 recently. The matter of the mechanism is the following. Rayleigh backscattering of the light propagating in the laser cavity creates additional distributed feedback in the fiber cavity leading to a very effective linewidth narrowing. This in turn creates the conditions for SBS in the fiber. The growth of SBS then causes a series of avalanche processes leading to Q-switching. Until now, passive Q-switching caused by the above-mentioned mechanism has been realized experimentally but with pump powers higher than 2 W1,2. At so high pump levels, the taser dynamics is complicated by a multiplicity of competing nonlinear effects impeding both the recogrution of initial RS-SBS process leading to Q-switching and comparison of experimental and theoretical results.
© 2000 IEEE
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