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Proceedings Paper

Energy transfer upconversion measurements for popular neodymium-doped crystals
Author(s): Sung Jin Yoon; RenPeng Yan; Stephen J. Beecher; Jacob I. Mackenzie
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Paper Abstract

We report our investigations on measuring the energy transfer upconversion (ETU) parameter in various neodymiumdoped 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 x10-16 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.

Paper Details

Date Published: 26 March 2015
PDF: 10 pages
Proc. SPIE 9342, Solid State Lasers XXIV: Technology and Devices, 93421D (26 March 2015); doi: 10.1117/12.2082707
Show Author Affiliations
Sung Jin Yoon, Univ. of Southampton (United Kingdom)
RenPeng Yan, Harbin Institute of Technology (China)
Stephen J. Beecher, Univ. of Southampton (United Kingdom)
Jacob I. Mackenzie, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 9342:
Solid State Lasers XXIV: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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