Relative intensity noise in a multi-Stokes Brillouin laser

Abstract

We investigate the Relative Intensity Noise (RIN) properties of a multi-Stokes Brillouin fiber ring laser. We experimentally analyse intensity noise of each Stokes waves and study the noise dynamics of the cascaded Brillouin scattering process. We observe up to 20 dB/Hz intensity noise reduction compared to that of the RIN input pump laser. We examine the impact of the fiber ring quality factor on the laser RIN features such as amplitude reduction and relaxation frequency. A numerical model based on a set of coupled-mode equations replicate the experimental observations; confirming the class B like behavior of a multi-Stokes Brillouin laser. Our study enables to determine the optimal parameter values to operate the multi-Stokes laser in the low noise regime.

Intracavity Brillouin gain characterization based on cavity ringdown spectroscopy

“…The establishement of SBS in an optical cavity [6] gives rise to the coherent emission of a Stokes wave. Impressive noise performances have been reported in such Brillouin lasers [7][8][9]. To reach such high laser performances, one of the most important parameters to evaluate is the material gain coefficient.…”

Brillouin Gain Characterization by Cavity Ringdown Spectroscopy

“…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.…”