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Temperature dependence of reversible photodarkening in Ga:La:S and Ga:La:S:O glass fibres

Temperature dependence of reversible photodarkening in Ga:La:S and Ga:La:S:O glass fibres
Temperature dependence of reversible photodarkening in Ga:La:S and Ga:La:S:O glass fibres
I. Introduction
Glasses based on gallium and lanthanum sulphides have been investigated because of their properties, such as low phonon energy, high rare-earth solubility and high nonlinearity, which make them attractive for the fabrication of active waveguide devices for photonic applications, such as fibre lasers, amplifiers and all-optical switches (1,2).

It is well known that glassy chalcogenides exhibit a number of modifications to their physical properties under the action of light or temperature (3). Reversible photodarkening (PD) is a red-shift of the position of the electronic edge, induced by bandgap or sub-bandgap illumination (4). We have investigated PD in unclad glass fibres with nominal composition 65Ga2S3:32La2S3:3La2O3 (Ga:La:S) and 72.5Ga2S3:27.5La2O3 (Ga:La:S:O) respectively. Both fundamental and practical reasons justify the interest in the PD effect in these materials. From a fundamental point of view, one is interested in understanding the phenomena underlying the absorption edge in these amorphous semiconducting materials. A more practical aspect is that PD also affects their transparency in the near IR region, which is relevant to most photonic applications. Here we report for the first time the existence of PD effect in these oxysulphide glasses and we present a description of its dependence on temperature, in the range 77-563 K.
Petrovich, M.
bfe895a0-da85-4a40-870a-2c7bfc84a4cf
Mairaj, A.K.
69f81e26-b09f-4c34-83ee-4388f94fa147
Hewak, D.W.
87c80070-c101-4f7a-914f-4cc3131e3db0
Rutt, Harvey
e09fa327-0c01-467a-9898-4e7f0cd715fc
Petrovich, M.
bfe895a0-da85-4a40-870a-2c7bfc84a4cf
Mairaj, A.K.
69f81e26-b09f-4c34-83ee-4388f94fa147
Hewak, D.W.
87c80070-c101-4f7a-914f-4cc3131e3db0
Rutt, Harvey
e09fa327-0c01-467a-9898-4e7f0cd715fc

Petrovich, M., Mairaj, A.K., Hewak, D.W. and Rutt, Harvey (2001) Temperature dependence of reversible photodarkening in Ga:La:S and Ga:La:S:O glass fibres. XIX International Congress on Glass, United Kingdom. 01 - 06 Jul 2001. 2 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

I. Introduction
Glasses based on gallium and lanthanum sulphides have been investigated because of their properties, such as low phonon energy, high rare-earth solubility and high nonlinearity, which make them attractive for the fabrication of active waveguide devices for photonic applications, such as fibre lasers, amplifiers and all-optical switches (1,2).

It is well known that glassy chalcogenides exhibit a number of modifications to their physical properties under the action of light or temperature (3). Reversible photodarkening (PD) is a red-shift of the position of the electronic edge, induced by bandgap or sub-bandgap illumination (4). We have investigated PD in unclad glass fibres with nominal composition 65Ga2S3:32La2S3:3La2O3 (Ga:La:S) and 72.5Ga2S3:27.5La2O3 (Ga:La:S:O) respectively. Both fundamental and practical reasons justify the interest in the PD effect in these materials. From a fundamental point of view, one is interested in understanding the phenomena underlying the absorption edge in these amorphous semiconducting materials. A more practical aspect is that PD also affects their transparency in the near IR region, which is relevant to most photonic applications. Here we report for the first time the existence of PD effect in these oxysulphide glasses and we present a description of its dependence on temperature, in the range 77-563 K.

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More information

Published date: 2001
Venue - Dates: XIX International Congress on Glass, United Kingdom, 2001-07-01 - 2001-07-06
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 17160
URI: https://eprints.soton.ac.uk/id/eprint/17160
PURE UUID: 522db08b-4391-4a2e-be08-a7ad16d7f023
ORCID for M. Petrovich: ORCID iD orcid.org/0000-0002-3905-5901
ORCID for D.W. Hewak: ORCID iD orcid.org/0000-0002-2093-5773

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Date deposited: 16 Sep 2005
Last modified: 06 Mar 2019 01:35

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Contributors

Author: M. Petrovich ORCID iD
Author: A.K. Mairaj
Author: D.W. Hewak ORCID iD
Author: Harvey Rutt

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