High-inversion densities in Nd:YAG: upconversion and bleaching
High-inversion densities in Nd:YAG: upconversion and bleaching
We report on the investigation of upconversion in Nd:YAG and its implications for intensely pumped devices. Analysis of lifetime measurements and the performance of a 1 at.% Nd-doped YAG amplifier give an Auger upconversion rate of 7 x 10-3 / s. This is significantly smaller than previously reported, but modeling of the performance of Nd:YAG devices with high-inversion densities shows that even this rate can still seriously degrade the small-signal gain and significantly increase the thermal load. The variation of cross-relaxation and upconversion rates with doping level is also described. Finally, it is found that the effect of bleaching of the Nd:YAG absorption can lead to a reduced spatial overlap between the signal and inversion profiles and thus can also significantly reduce the gain.
900-909
Guy, S.
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Bonner, C.L.
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Shepherd, D.P.
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Hanna, D.C.
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Tropper, A.C.
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Ferrand, B.
6d708ea8-722e-4a6c-a7ea-54bc9121f620
1998
Guy, S.
9c3fee40-ddec-4126-9289-8400c49d6f68
Bonner, C.L.
96e1b86d-6161-469a-b090-9aacf1e96c98
Shepherd, D.P.
9fdd51c4-39d6-41b3-9021-4c033c2f4ead
Hanna, D.C.
3da5a5b4-71c2-4441-bb67-21f0d28a187d
Tropper, A.C.
f3505426-e0d5-4e91-aed3-aecdb44b393c
Ferrand, B.
6d708ea8-722e-4a6c-a7ea-54bc9121f620
Guy, S., Bonner, C.L., Shepherd, D.P., Hanna, D.C., Tropper, A.C. and Ferrand, B.
(1998)
High-inversion densities in Nd:YAG: upconversion and bleaching.
IEEE Journal of Quantum Electronics, 34 (5), .
(doi:10.1109/3.668778).
Abstract
We report on the investigation of upconversion in Nd:YAG and its implications for intensely pumped devices. Analysis of lifetime measurements and the performance of a 1 at.% Nd-doped YAG amplifier give an Auger upconversion rate of 7 x 10-3 / s. This is significantly smaller than previously reported, but modeling of the performance of Nd:YAG devices with high-inversion densities shows that even this rate can still seriously degrade the small-signal gain and significantly increase the thermal load. The variation of cross-relaxation and upconversion rates with doping level is also described. Finally, it is found that the effect of bleaching of the Nd:YAG absorption can lead to a reduced spatial overlap between the signal and inversion profiles and thus can also significantly reduce the gain.
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Published date: 1998
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Local EPrints ID: 77876
URI: http://eprints.soton.ac.uk/id/eprint/77876
ISSN: 0018-9197
PURE UUID: 32e894e6-83d1-4acb-b674-4c80bc11b3d4
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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 02:34
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Author:
S. Guy
Author:
C.L. Bonner
Author:
D.P. Shepherd
Author:
D.C. Hanna
Author:
A.C. Tropper
Author:
B. Ferrand
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