The University of Southampton
University of Southampton Institutional Repository

Highly efficient Raman distributed feedback fibre lasers

Highly efficient Raman distributed feedback fibre lasers
Highly efficient Raman distributed feedback fibre lasers
We demonstrate highly efficient Raman distributed feedback (DFB) fibre lasers for the first time with up to 1.6W of continuous wave (CW) output power. The DFB Bragg gratings are written directly into two types of commercially available passive germano-silica fibres. Two lasers of 30cm length are pumped with up to 15W of CW power at 1068nm. The threshold power is ~2W for a Raman-DFB (R-DFB) laser written in standard low-NA fibre, and only ~1W for a laser written in a high-NA fibre, both of which oscillate in a narrow linewidth of <0.01nm at ~1117nm and ~1109nm, respectively. The slope efficiencies are ~74% and ~93% with respect to absorbed pump power in the low-NA fibre and high-NA fibre respectively. Such high conversion efficiency suggests that very little energy is lost in the form of heat through inefficient energy transfer. Our results are supported by numerical simulations, and furthermore open up for the possibility of having narrow linewidth all-fibre laser sources in wavelength bands not traditionally covered by rare-earth doped silica fibres. Simulations also imply that this technology has the potential to produce even shorter R-DFB laser devices at the centimetre-level and with mW-level thresholds, if Bragg gratings formed in fibre materials with higher intrinsic Raman gain coefficient than silica are used. These materials include for example tellurite or chalcogenide glasses. Using glasses like these would also open up the possibility of having narrow linewidth fibre sources with DFB laser oscillating much further into the IR than what currently is possible with rare-earth doped silica glasses.
1094-4087
5082-5091
Shi, Jindan
eafa09a7-4307-4f34-8932-6b82dfd2a10c
Alam, Shaif-ul
2b6bdbe5-ddcc-4a88-9057-299360b93435
Ibsen, Morten
22e58138-5ce9-4bed-87e1-735c91f8f3b9
Shi, Jindan
eafa09a7-4307-4f34-8932-6b82dfd2a10c
Alam, Shaif-ul
2b6bdbe5-ddcc-4a88-9057-299360b93435
Ibsen, Morten
22e58138-5ce9-4bed-87e1-735c91f8f3b9

Shi, Jindan, Alam, Shaif-ul and Ibsen, Morten (2012) Highly efficient Raman distributed feedback fibre lasers. Optics Express, 20 (5), 5082-5091. (doi:10.1364/OE.20.005082).

Record type: Article

Abstract

We demonstrate highly efficient Raman distributed feedback (DFB) fibre lasers for the first time with up to 1.6W of continuous wave (CW) output power. The DFB Bragg gratings are written directly into two types of commercially available passive germano-silica fibres. Two lasers of 30cm length are pumped with up to 15W of CW power at 1068nm. The threshold power is ~2W for a Raman-DFB (R-DFB) laser written in standard low-NA fibre, and only ~1W for a laser written in a high-NA fibre, both of which oscillate in a narrow linewidth of <0.01nm at ~1117nm and ~1109nm, respectively. The slope efficiencies are ~74% and ~93% with respect to absorbed pump power in the low-NA fibre and high-NA fibre respectively. Such high conversion efficiency suggests that very little energy is lost in the form of heat through inefficient energy transfer. Our results are supported by numerical simulations, and furthermore open up for the possibility of having narrow linewidth all-fibre laser sources in wavelength bands not traditionally covered by rare-earth doped silica fibres. Simulations also imply that this technology has the potential to produce even shorter R-DFB laser devices at the centimetre-level and with mW-level thresholds, if Bragg gratings formed in fibre materials with higher intrinsic Raman gain coefficient than silica are used. These materials include for example tellurite or chalcogenide glasses. Using glasses like these would also open up the possibility of having narrow linewidth fibre sources with DFB laser oscillating much further into the IR than what currently is possible with rare-earth doped silica glasses.

Text
oe-20-5-5082 - Version of Record
Available under License Creative Commons Attribution.
Download (1MB)

More information

Published date: 27 February 2012
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 334050
URI: http://eprints.soton.ac.uk/id/eprint/334050
ISSN: 1094-4087
PURE UUID: 4fea8559-d829-4cc3-a807-bdd9fc21bc02

Catalogue record

Date deposited: 06 Mar 2012 13:56
Last modified: 14 Mar 2024 10:32

Export record

Altmetrics

Contributors

Author: Jindan Shi
Author: Shaif-ul Alam
Author: Morten Ibsen

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.

×