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Energy-transfer upconversion and thermal lensing in high-power end-pumped Nd:YLF laser crystals

Energy-transfer upconversion and thermal lensing in high-power end-pumped Nd:YLF laser crystals
Energy-transfer upconversion and thermal lensing in high-power end-pumped Nd:YLF laser crystals
Thermal lensing in an end-pumped Nd:YLF rod, under lasing and non-lasing conditions, has been investigated. Under lasing conditions a weak thermal lens, with dioptric power varying linearly with pump power, was observed. Under non-lasing conditions where higher inversion densities are involved, hence relevant to Q-switched operation or operation as an amplifier, a much stronger thermal lens was measured, whose power increased non-linearly with pump power. This difference has been attributed to the increased heat deposition due to the subsequent multiphonon decay following various interionic upconversion processes, which increase strongly under non-lasing conditions, and is further exacerbated by the unfavourable temperature dependencies of heat conductivity and rate of change of refractive index with temperature. A strategy for reducing upconversion and its associated thermal loading, without degrading laser performance, is discussed.
0018-9197
647-655
Hardman, P.J.
2b18897a-de16-4a46-9e91-0b27f905a120
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2
Friel, G.J.
67bf6510-6625-4124-9154-129992b53740
Pollnau, M.
1094856b-791a-4050-98d9-c07777d5f0f5
Hanna, David
3da5a5b4-71c2-4441-bb67-21f0d28a187d
Hardman, P.J.
2b18897a-de16-4a46-9e91-0b27f905a120
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2
Friel, G.J.
67bf6510-6625-4124-9154-129992b53740
Pollnau, M.
1094856b-791a-4050-98d9-c07777d5f0f5
Hanna, David
3da5a5b4-71c2-4441-bb67-21f0d28a187d

Hardman, P.J., Clarkson, W.A., Friel, G.J., Pollnau, M. and Hanna, David (1999) Energy-transfer upconversion and thermal lensing in high-power end-pumped Nd:YLF laser crystals. IEEE Journal of Quantum Electronics, 35 (4), 647-655. (doi:10.1109/3.753670).

Record type: Article

Abstract

Thermal lensing in an end-pumped Nd:YLF rod, under lasing and non-lasing conditions, has been investigated. Under lasing conditions a weak thermal lens, with dioptric power varying linearly with pump power, was observed. Under non-lasing conditions where higher inversion densities are involved, hence relevant to Q-switched operation or operation as an amplifier, a much stronger thermal lens was measured, whose power increased non-linearly with pump power. This difference has been attributed to the increased heat deposition due to the subsequent multiphonon decay following various interionic upconversion processes, which increase strongly under non-lasing conditions, and is further exacerbated by the unfavourable temperature dependencies of heat conductivity and rate of change of refractive index with temperature. A strategy for reducing upconversion and its associated thermal loading, without degrading laser performance, is discussed.

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Published date: 1999

Identifiers

Local EPrints ID: 77865
URI: https://eprints.soton.ac.uk/id/eprint/77865
ISSN: 0018-9197
PURE UUID: 957a1ab5-84f0-4a75-a138-2b70004f12fa

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Date deposited: 11 Mar 2010
Last modified: 17 Jul 2019 00:13

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