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Visible upconversion in rare-earth doped gallium lanthanum sulphide based glasses

Visible upconversion in rare-earth doped gallium lanthanum sulphide based glasses
Visible upconversion in rare-earth doped gallium lanthanum sulphide based glasses
Chalcogenide glasses are usually known for their good infrared and poor visible transparency which limit their applications to passive and active devices in the infrared wavelength region. Gallium lanthanum sulphide glasses, however, show visible transparency down to 500nm. The low phonon energy of the glass increases the radiative quantum efficiency of rare-earth energy levels compared to commonly used fluorozirconate glasses and provides long-lived intermediate levels for efficient two-step excitation to visible energy levels. Green and red upconversion emission has been observed in Pr3+, Nd3+, Ho3+, and Er3+ doped glasses under Ti:sapphire pumping in wavelengths regions where diode laser sources are easily available. Lifetime measurements reveal the excitation process is either excited-state absorption or upconversion caused by ion-ion interactions. Modification of the glass with lanthanum oxide or ceasium chloride improves the visible transparency and shifts the UV absorption edge to 450nm and 400nm, respectively, and also improves the fibre drawing of these glasses
Schweizer, T.
1b183bb4-c89d-42bf-81e0-b2e2b9af2635
Hector, J.R.
28b5aa8c-f863-4e22-b07a-6a28aed60ebc
Brady, D.
55287452-1736-45f0-b6b7-64394df3258d
Wang, J.
53d8d8bd-3c17-406e-9acf-961cc86b9a00
Hewak, D.
87c80070-c101-4f7a-914f-4cc3131e3db0
Brocklesby, W.S.
c53ca2f6-db65-4e19-ad00-eebeb2e6de67
Payne, D.N.
4f592b24-707f-456e-b2c6-8a6f750e296d
Schweizer, T.
1b183bb4-c89d-42bf-81e0-b2e2b9af2635
Hector, J.R.
28b5aa8c-f863-4e22-b07a-6a28aed60ebc
Brady, D.
55287452-1736-45f0-b6b7-64394df3258d
Wang, J.
53d8d8bd-3c17-406e-9acf-961cc86b9a00
Hewak, D.
87c80070-c101-4f7a-914f-4cc3131e3db0
Brocklesby, W.S.
c53ca2f6-db65-4e19-ad00-eebeb2e6de67
Payne, D.N.
4f592b24-707f-456e-b2c6-8a6f750e296d

Schweizer, T., Hector, J.R., Brady, D., Wang, J., Hewak, D., Brocklesby, W.S. and Payne, D.N. (1998) Visible upconversion in rare-earth doped gallium lanthanum sulphide based glasses. 9th International Conference on Modern Materials & Technologie (CIMTEC '98 ), Italy. 14 - 19 Jun 1998.

Record type: Conference or Workshop Item (Paper)

Abstract

Chalcogenide glasses are usually known for their good infrared and poor visible transparency which limit their applications to passive and active devices in the infrared wavelength region. Gallium lanthanum sulphide glasses, however, show visible transparency down to 500nm. The low phonon energy of the glass increases the radiative quantum efficiency of rare-earth energy levels compared to commonly used fluorozirconate glasses and provides long-lived intermediate levels for efficient two-step excitation to visible energy levels. Green and red upconversion emission has been observed in Pr3+, Nd3+, Ho3+, and Er3+ doped glasses under Ti:sapphire pumping in wavelengths regions where diode laser sources are easily available. Lifetime measurements reveal the excitation process is either excited-state absorption or upconversion caused by ion-ion interactions. Modification of the glass with lanthanum oxide or ceasium chloride improves the visible transparency and shifts the UV absorption edge to 450nm and 400nm, respectively, and also improves the fibre drawing of these glasses

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More information

Published date: 1998
Venue - Dates: 9th International Conference on Modern Materials & Technologie (CIMTEC '98 ), Italy, 1998-06-14 - 1998-06-19

Identifiers

Local EPrints ID: 76679
URI: https://eprints.soton.ac.uk/id/eprint/76679
PURE UUID: b2bd65d4-915b-410c-a847-99157680eda8
ORCID for D. Hewak: ORCID iD orcid.org/0000-0002-2093-5773
ORCID for W.S. Brocklesby: ORCID iD orcid.org/0000-0002-2123-6712

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 03 Apr 2019 00:37

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