The University of Southampton
University of Southampton Institutional Repository

Non-linear transmission in germanosilicate fibres at blue/green wavelengths

Non-linear transmission in germanosilicate fibres at blue/green wavelengths
Non-linear transmission in germanosilicate fibres at blue/green wavelengths
Many fibre-based devices rely on the ability to transmit light at high intensities down single-mode fibres. Examples are fibre lasers, amplifiers, second-harmonic generators and simple fibre-based high power delivery systems. It is thus important to know whether any non-linear processes exist that could restrict the usefulness of the fibres used in these applications. Brown et al have reported that non-linear effects of this kind do indeed occur at Argon ion wavelengths in germanosilicate fibre, limiting the power that can be delivered to some tenths of a W over only few-metre lengths of single-mode fibre. In this paper we report the chief results of an extensive investigation into this effect in germanosilicate HiBi fibres designed to transmit single-mode blue/green light. These observed non-linearities in the transmission of CW blue/green light cannot be attributed to conventional non-linear processes (such as stimulated Raman or Brillouin scattering) because only short (few-metre) fibre lengths are needed, the thresholds are low, and the effect is insensitive to laser line-width. We have indicated that this non-linear behaviour can be explained by the creation (via two-photon absorption - TPA) and bleaching (via normal absorption) of colour-centres. TPA enables blue/green photons to reach UV energy levels that are sufficient to disrupt the glass matrix, and even though the TPA rate is very low at intensity levels where non-linear transmission is significant, the long path lengths in the fibre, added to the high likelihood of colour-centre formation by quanta at double the photon energy, mean that colour-centres created by TPA can have a dramatic effect on transmission
Poyntz-Wright, L.J.
1acbc672-a9cb-4183-a841-82c52831bfb3
Fermann, M.E.
7b069725-c906-4b27-9b6d-1034b99b0cf7
Russell, P.St.J.
77db5e8d-8223-4806-ae60-a106619a022a
Poyntz-Wright, L.J.
1acbc672-a9cb-4183-a841-82c52831bfb3
Fermann, M.E.
7b069725-c906-4b27-9b6d-1034b99b0cf7
Russell, P.St.J.
77db5e8d-8223-4806-ae60-a106619a022a

Poyntz-Wright, L.J., Fermann, M.E. and Russell, P.St.J. (1988) Non-linear transmission in germanosilicate fibres at blue/green wavelengths. IEE Colloquium on Non-Linear Optical Waveguides, United Kingdom.

Record type: Conference or Workshop Item (Paper)

Abstract

Many fibre-based devices rely on the ability to transmit light at high intensities down single-mode fibres. Examples are fibre lasers, amplifiers, second-harmonic generators and simple fibre-based high power delivery systems. It is thus important to know whether any non-linear processes exist that could restrict the usefulness of the fibres used in these applications. Brown et al have reported that non-linear effects of this kind do indeed occur at Argon ion wavelengths in germanosilicate fibre, limiting the power that can be delivered to some tenths of a W over only few-metre lengths of single-mode fibre. In this paper we report the chief results of an extensive investigation into this effect in germanosilicate HiBi fibres designed to transmit single-mode blue/green light. These observed non-linearities in the transmission of CW blue/green light cannot be attributed to conventional non-linear processes (such as stimulated Raman or Brillouin scattering) because only short (few-metre) fibre lengths are needed, the thresholds are low, and the effect is insensitive to laser line-width. We have indicated that this non-linear behaviour can be explained by the creation (via two-photon absorption - TPA) and bleaching (via normal absorption) of colour-centres. TPA enables blue/green photons to reach UV energy levels that are sufficient to disrupt the glass matrix, and even though the TPA rate is very low at intensity levels where non-linear transmission is significant, the long path lengths in the fibre, added to the high likelihood of colour-centre formation by quanta at double the photon energy, mean that colour-centres created by TPA can have a dramatic effect on transmission

PDF
355.pdf - Other
Download (207kB)

More information

Published date: 2 June 1988
Venue - Dates: IEE Colloquium on Non-Linear Optical Waveguides, United Kingdom, 1988-06-02

Identifiers

Local EPrints ID: 77588
URI: https://eprints.soton.ac.uk/id/eprint/77588
PURE UUID: 90171451-410c-4362-a2ee-4a7cfff4d922

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:31

Export record

Contributors

Author: L.J. Poyntz-Wright
Author: M.E. Fermann
Author: P.St.J. Russell

University divisions

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 https://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.

×