Visible upconversion in rare-earth doped gallium lanthanum sulphide based glasses
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. In, 9th International Conference on Modern Materials & Technologie (CIMTEC '98 ), Florence, IT, 14 - 19 Jun 1998.
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Description/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
| Item Type: | Conference or Workshop Item (Paper) |
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| Related URLs: | |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering Q Science > QC Physics |
| Divisions: | University Structure - Pre August 2011 > Optoelectronics Research Centre |
| Item ID: | 76679 |
| Date Deposited: | 11 Mar 2010 |
| Last Modified: | 02 Mar 2012 11:22 |
| Contributors: | Schweizer, T. (Author) Hector, J.R. (Author) Brady, D. (Author) Wang, J. (Author) Hewak, D. (Author) Brocklesby, W.S. (Author) Payne, D.N. (Author) |
| Date: | 1998 |
| Status: | Unpublished |
| URI: | http://eprints.soton.ac.uk/id/eprint/76679 |
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