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 [1]. Implementing SBS in an optical cavity gives rise to coherent emission with impressive performances in terms of noise and linewidth [2]. Cascading the SBS process can even, under given conditions, improves the coherent emission specifications [3]. To achieve such performances it is crucial to determine the Brillouin gain coefficient. Usual pump-probe methods are carried out in single pass waveguides [4].

© 2019 IEEE

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