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High-inversion densities in Nd:YAG: upconversion and bleaching

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.
0018-9197
900-909
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.
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), 900-909. (doi:10.1109/3.668778).

Record type: Article

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

Identifiers

Local EPrints ID: 77876
URI: https://eprints.soton.ac.uk/id/eprint/77876
ISSN: 0018-9197
PURE UUID: 32e894e6-83d1-4acb-b674-4c80bc11b3d4
ORCID for D.P. Shepherd: ORCID iD orcid.org/0000-0002-4561-8184

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Date deposited: 11 Mar 2010
Last modified: 19 Jul 2019 01:21

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