Abstract
We report a technique based upon the cavity ringdown method that enables to characterize the Brillouin gain coefficient directly in a laser cavity. Material gain, optical cavity parameters and lasing properties can be extracted from measurements whithin a single experiment.
Highlights
The constant need for laser spectral purity improvements is driven by the growing panel of applications in fundamental [1, 2] and applied physics [3, 4]
We propose to extend the use of the cavity ringdown method (CRDM) to retrieve the Brillouin gain coefficient
A cavity ringdown method is applied to stimulated Brillouin scattering in fiber cavity
Summary
The constant need for laser spectral purity improvements is driven by the growing panel of applications in fundamental [1, 2] and applied physics [3, 4]. Introducing ∆νB value and material constants, extracted by other experimental means or from calculations, into Eq (1) gives a Brillouin gain coefficient estimation. Performing Brillouin gain characterization inside the laser cavity allows to take advantage of the light recirculation of the Stokes wave inside the resonator This tends to strongly reduce the length of the waveguide and the applied laser-pump power required to reach the SBS threshold in comparison to usual pump-probe techniques. We detail the experimental bench used to generate and probe the SBS gain in the cavity and we detail and discuss our results
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