The University of Southampton
University of Southampton Institutional Repository

Suppression of stimulated Brillouin scattering in high power fibre lasers and amplifiers

Suppression of stimulated Brillouin scattering in high power fibre lasers and amplifiers
Suppression of stimulated Brillouin scattering in high power fibre lasers and amplifiers
Fibre sources in high power devices have significant advantages over conventional gas and solid state lasers. However, for applications that require the so-called singlefrequency sources with narrow linewidths, the output power is low mainly because of the problem of the stimulated Brillouin scattering (SBS).

A model that accounts for the SBS in dual-clad fibre lasers and amplifiers is presented. This was carried out in order to study the key parameters that affect the Brillouin threshold. Furthermore, the model was extended to account for the effect that the fibre axial temperature distribution has on the SBS threshold. Numerical solutions of the coupled differential equations for the evolution of the different beams showed a good agreement between the simulated data and reported experimental results. In addition, the model was used to study the relation of the core radius, the fibre length, and the fibre background loss on the SBS threshold. It was demonstrated that an adequate fibre structure design and a proper thermal management of the fibre amplifier lead to the suppression of SBS.

Rare-earth doped fibre preforms with different compositions and geometries were fabricated by Modified Chemical Vapour Deposition technique in order to characterise the effect of doping and fibre structure on the Brillouin frequency and linewidth. Measurements using a microwave detection system for coherent detection of the anti-Stokes spontaneous Brillouin backscatter were performed on these fibres. The results showed that the actual Brillouin gain, linewidth and frequency shift widely differ from the values for pure fused silica fibres. It was confirmed that the fibre structure and composition play a big role in the Brillouin linewidth and Brillouin frequency shift of the fibre
University of Southampton
Hernandez-Solis, Vladimir
2f29ec6a-1b7b-491e-b48a-2efba29b3b91
Hernandez-Solis, Vladimir
2f29ec6a-1b7b-491e-b48a-2efba29b3b91
Sahu, Jayanta
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2

Hernandez-Solis, Vladimir (2009) Suppression of stimulated Brillouin scattering in high power fibre lasers and amplifiers. University of Southampton, Optoelectronic Research Centre, Masters Thesis, 75pp.

Record type: Thesis (Masters)

Abstract

Fibre sources in high power devices have significant advantages over conventional gas and solid state lasers. However, for applications that require the so-called singlefrequency sources with narrow linewidths, the output power is low mainly because of the problem of the stimulated Brillouin scattering (SBS).

A model that accounts for the SBS in dual-clad fibre lasers and amplifiers is presented. This was carried out in order to study the key parameters that affect the Brillouin threshold. Furthermore, the model was extended to account for the effect that the fibre axial temperature distribution has on the SBS threshold. Numerical solutions of the coupled differential equations for the evolution of the different beams showed a good agreement between the simulated data and reported experimental results. In addition, the model was used to study the relation of the core radius, the fibre length, and the fibre background loss on the SBS threshold. It was demonstrated that an adequate fibre structure design and a proper thermal management of the fibre amplifier lead to the suppression of SBS.

Rare-earth doped fibre preforms with different compositions and geometries were fabricated by Modified Chemical Vapour Deposition technique in order to characterise the effect of doping and fibre structure on the Brillouin frequency and linewidth. Measurements using a microwave detection system for coherent detection of the anti-Stokes spontaneous Brillouin backscatter were performed on these fibres. The results showed that the actual Brillouin gain, linewidth and frequency shift widely differ from the values for pure fused silica fibres. It was confirmed that the fibre structure and composition play a big role in the Brillouin linewidth and Brillouin frequency shift of the fibre

Text
Hernandez 2009 mphil - Version of Record
Available under License University of Southampton Thesis Licence.
Download (941kB)

More information

Published date: March 2009
Organisations: University of Southampton

Identifiers

Local EPrints ID: 70910
URI: http://eprints.soton.ac.uk/id/eprint/70910
PURE UUID: af1a9888-9dcd-4bc1-8b1c-72a7c349ecd5

Catalogue record

Date deposited: 11 Dec 2009
Last modified: 29 Jan 2020 13:04

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×