Brillouin scattering

About: Brillouin scattering is a research topic. Over the lifetime, 11426 publications have been published within this topic receiving 178306 citations.

Cavity enhanced stimulated Brillouin scattering in an optical chip for multiorder Stokes generation

Abstract: The support of the Australian Research Council (ARC) through its Discovery grant (DP1096838), Centre of Excellence scheme and Federation Fellowship is acknowledged.

Brillouin Scattering and Segmental Motion of a Polymeric Liquid, I.

Abstract: The effect of segmental motion on the density–density correlation function of a viscous polymer liquid has been analyzed using a generalized relaxation equation developed by Zwanzig and Mori. It is shown that for polymer liquids of high viscosity, Brillouin scattering is closely associated with the structural relaxation associated with the motion chain segments. A single relaxation time theory is shown to yield good agreement with the experimental results on polypropylene glycol. The torsional motion involving a small number of monomer units is shown to be responsible for the dispersion and attenuation of the hypersonic wave. The fact that the Brillouin scattering spectrum of a polymer liquid is insensitive to the change of molecular weight is discussed. We have shown that temporal modulation of the spatial second moment of the intermolecular or intersegmental interaction energy is responsible for the relaxation process involved in Brillouin scattering.

Technique of reducing the Kerr effect and extending the dynamic range in a brillouin fiber optic gyroscope

Abstract: A Brillouin fiber optic gyroscope includes an intensity modulator in the optical loop which periodically attenuates the Brillouin light waves counterpropagating in the optical loop so that the counterpropagating Brillouin waves each propagate as square waves. The use of square wave modulation for the counterpropagating light wave reduces the cross-effect of the Brillouin waves to substantially the same magnitude as the self-effect so that the non-reciprocal Kerr effect is substantially reduced or eliminated. In order to support the counterpropagating square waves, the optical loop is pumped with pump light having frequency components selected to pump the optical fiber to provide Brillouin light at frequencies necessary to generate square waves in the counterpropagating Brillouin light waves. In addition, the Brillouin light must be generated at the correct intensity and phase relationship to form the square wave. Because the relationship between the pump light and the generated Brillouin light is a non-linear function, the relative magnitudes of the frequency components of the pump light are selected to be different from the relative magnitudes of the Brillouin light so that when the pump light is applied to the optical loop, the transfer function results in the correct magnitudes for the frequency components of the Brillouin light. The intensity modulator assures that the Brillouin light is maintained in the proper phase relationship to maintain a square waveform.

Evaluation of performance parameters of single-mode all-fiber Brillouin ring lasers.

Abstract: An analytical theory of the operation of all-fiber Brillouin ring lasers that accounts for pump depletion is presented. Expressions for stimulated Brillouin scattering lasing threshold power, output Stokes power, and conversion efficiency are derived. It is shown that the fiber cavity detunes from its resonant value owing to the buildup of the counterpropagating Stokes wave, which can be a limitation in the performance of all-fiber resonator systems. The application of the theory is in the design and optimization of performance parameters of devices using all-fiber ring resonators, particularly Brillouin lasers and gyroscopes.