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Energy transfer upconversion measurements for popular neodymium-doped crystals

Energy transfer upconversion measurements for popular neodymium-doped crystals
Energy transfer upconversion measurements for popular neodymium-doped crystals
We report our investigations on measuring the energy transfer upconversion (ETU) parameter in various neodymium-doped laser crystals (YAG, YVO4, GdVO4, KGW, and YLF) via the z-scan technique. Starting with a simple two-level macro-parameter spatially dependent rate equation model we obtain a good correlation for Nd:YAG at different concentrations and crystal temperatures, however the other crystals illustrate significant deviation between simulation and measurement. Currently we attribute this difference to additional ion-ion interactions in the respective samples, for which a more detailed model is currently being considered. Of the tested materials Nd:YAG appears to have the lowest ETU macro parameter, at around 0.35 x 10-16 cm3/s for a 0.6 at.% doping concentration, compared with nominally thrice this for 0.5 at% Nd:YLF and almost an order of magnitude higher for the 0.5 at.% vanadates (YVO4 and GdVO4). These values are significant for determining additional heat load in the respective gain media, especially when trying to increase the output power/energy from lasers employing these crystals, typically achieved by increasing the pump and cavity mode size.
Yoon, S.J.
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Yan, R.P.
5337a6fa-afac-4693-8d92-a6b79276b8dd
Beecher, S.J.
b3664adc-d6b5-4a5a-a09a-8e1415c6d3f5
Mackenzie, J.I.
1d82c826-fdbf-425b-ac04-be43ccf12008
Yoon, S.J.
fcca92bf-3283-4ba8-85d5-767ca419aa9f
Yan, R.P.
5337a6fa-afac-4693-8d92-a6b79276b8dd
Beecher, S.J.
b3664adc-d6b5-4a5a-a09a-8e1415c6d3f5
Mackenzie, J.I.
1d82c826-fdbf-425b-ac04-be43ccf12008

Yoon, S.J., Yan, R.P., Beecher, S.J. and Mackenzie, J.I. (2015) Energy transfer upconversion measurements for popular neodymium-doped crystals. SPIE Photonics West '15, San Francisco, United States. 07 - 12 Feb 2015. (doi:10.1117/12.2082707).

Record type: Conference or Workshop Item (Paper)

Abstract

We report our investigations on measuring the energy transfer upconversion (ETU) parameter in various neodymium-doped laser crystals (YAG, YVO4, GdVO4, KGW, and YLF) via the z-scan technique. Starting with a simple two-level macro-parameter spatially dependent rate equation model we obtain a good correlation for Nd:YAG at different concentrations and crystal temperatures, however the other crystals illustrate significant deviation between simulation and measurement. Currently we attribute this difference to additional ion-ion interactions in the respective samples, for which a more detailed model is currently being considered. Of the tested materials Nd:YAG appears to have the lowest ETU macro parameter, at around 0.35 x 10-16 cm3/s for a 0.6 at.% doping concentration, compared with nominally thrice this for 0.5 at% Nd:YLF and almost an order of magnitude higher for the 0.5 at.% vanadates (YVO4 and GdVO4). These values are significant for determining additional heat load in the respective gain media, especially when trying to increase the output power/energy from lasers employing these crystals, typically achieved by increasing the pump and cavity mode size.

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More information

Published date: 2015
Venue - Dates: SPIE Photonics West '15, San Francisco, United States, 2015-02-07 - 2015-02-12
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 375075
URI: https://eprints.soton.ac.uk/id/eprint/375075
PURE UUID: 71cfaac5-21ed-475c-b3ce-586b00ccbb1e
ORCID for J.I. Mackenzie: ORCID iD orcid.org/0000-0002-3355-6051

Catalogue record

Date deposited: 11 Mar 2015 12:48
Last modified: 19 Jul 2019 01:03

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