The University of Southampton
University of Southampton Institutional Repository

High energy passive Q-switching of an erbium fiber laser using a nonlinear liquifying gallium mirror

High energy passive Q-switching of an erbium fiber laser using a nonlinear liquifying gallium mirror
High energy passive Q-switching of an erbium fiber laser using a nonlinear liquifying gallium mirror
It has been recently reported that the reflectivity of a gallium:glass interface becomes strongly nonlinear at temperatures close to, but below gallium's melting point of ~30°C. The nonlinearity is attributed to a surface-assisted, optically-induced structural phase transition from the stable phase of solid gallium (alpha-gallium) to some other, as yet unidentified, metastable phase of higher reflectivity. It has been observed both in the visible and the near infrared, and characterised fully at 1550 nm. Optical intensities of -1kW/cm are sufficient to change the optical reflectivity of a gallium:glass interface from 50% to 65% at 1550nm, with a turn-on time shorter than 10ns, and temperature dependent turn-off time in the range 10-1000 ns. Initial experiments had shown that this nonlinearity could be used for passive Q-switching of an erbium fiber laser ring cavity. Using a 15m cavity and a fiber butt-coupled gallium mirror we obtained 1 - 2 ps pulses with peak powers of 0.5 W. Whilst this was an important result, the first practical demonstration of the concept, the laser performance itself was not particularly impressive. In this paper we present more recent results with a more optimized cavity which show that liquefying gallium mirrors can be used to generate much shorter pulses of much higher intensity and indeed give comparable results to those achieved with state-of-the-art semiconductor saturable absorbers.
Optical Society of America
Petropoulos, P.
522b02cc-9f3f-468e-bca5-e9f58cc9cad7
Offerhaus, H.L.
75130d34-dbad-4f37-bbd4-08fa7c0f9d4b
Richardson, D.J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Dhanjal, S.
a3f4fa8d-654f-4162-bd38-67c9b2d2f136
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Petropoulos, P.
522b02cc-9f3f-468e-bca5-e9f58cc9cad7
Offerhaus, H.L.
75130d34-dbad-4f37-bbd4-08fa7c0f9d4b
Richardson, D.J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Dhanjal, S.
a3f4fa8d-654f-4162-bd38-67c9b2d2f136
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6

Petropoulos, P., Offerhaus, H.L., Richardson, D.J., Dhanjal, S. and Zheludev, N.I. (1999) High energy passive Q-switching of an erbium fiber laser using a nonlinear liquifying gallium mirror. In Proceedings of Novel Lasers and Devices-Basic Aspects (NLDA). Optical Society of America..

Record type: Conference or Workshop Item (Paper)

Abstract

It has been recently reported that the reflectivity of a gallium:glass interface becomes strongly nonlinear at temperatures close to, but below gallium's melting point of ~30°C. The nonlinearity is attributed to a surface-assisted, optically-induced structural phase transition from the stable phase of solid gallium (alpha-gallium) to some other, as yet unidentified, metastable phase of higher reflectivity. It has been observed both in the visible and the near infrared, and characterised fully at 1550 nm. Optical intensities of -1kW/cm are sufficient to change the optical reflectivity of a gallium:glass interface from 50% to 65% at 1550nm, with a turn-on time shorter than 10ns, and temperature dependent turn-off time in the range 10-1000 ns. Initial experiments had shown that this nonlinearity could be used for passive Q-switching of an erbium fiber laser ring cavity. Using a 15m cavity and a fiber butt-coupled gallium mirror we obtained 1 - 2 ps pulses with peak powers of 0.5 W. Whilst this was an important result, the first practical demonstration of the concept, the laser performance itself was not particularly impressive. In this paper we present more recent results with a more optimized cavity which show that liquefying gallium mirrors can be used to generate much shorter pulses of much higher intensity and indeed give comparable results to those achieved with state-of-the-art semiconductor saturable absorbers.

Full text not available from this repository.

More information

Published date: 1999
Venue - Dates: Novel Lasers and Devices-Basic Aspects (NLDA), Germany, 1999-06-13 - 1999-06-17

Identifiers

Local EPrints ID: 76560
URI: https://eprints.soton.ac.uk/id/eprint/76560
PURE UUID: 3b2a1180-f77c-4173-98db-d9b60edaa7f5
ORCID for P. Petropoulos: ORCID iD orcid.org/0000-0002-1576-8034
ORCID for D.J. Richardson: ORCID iD orcid.org/0000-0002-7751-1058
ORCID for N.I. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 06 Mar 2019 01:37

Export record

Contributors

Author: P. Petropoulos ORCID iD
Author: H.L. Offerhaus
Author: D.J. Richardson ORCID iD
Author: S. Dhanjal
Author: N.I. Zheludev ORCID iD

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.

×