Nowadays, narrow linewidth lasers are unavoidable tools for fundamental and applied physics. One promising approach to generate coherent laser emission is based on stimulated Brillouin scattering (SBS) optical nonlinearity . Implementing SBS in an optical cavity gives rise to coherent emission with impressive performances in terms of noise and linewidth . Cascading the SBS process can even, under given conditions, improves the coherent emission specifications . To achieve such performances it is crucial to determine the Brillouin gain coefficient. Usual pump-probe methods are carried out in single pass waveguides .
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