Influence of energy-transfer-upconversion on threshold pump power in quasi-three-level solid-state lasers
Influence of energy-transfer-upconversion on threshold pump power in quasi-three-level solid-state lasers
A simple analytical expression for threshold pump power in an end-pumped quasi-three-level solid-state laser, which takes into account the influence of energy-transfer-upconversion (ETU), is derived. This expression indicates that threshold pump power can be increased dramatically by ETU, especially in low gain lasers and lasers with pronounced three-level character due to the need for high excitation densities in the upper manifold to reach threshold. The analysis has been applied to an Er:YAG laser operating at 1645 nm in-band pumped by an Er,Yb fiber laser at 1532 nm. Predicted values for threshold pump power as a function of erbium doping concentration are in very good agreement with measured values. The results indicate that very low erbium doping levels (~0.25 at.% or less) are required to avoid degradation in performance due to ETU even under continuous-wave lasing conditions in Er:YAG.
11935-11943
Kim, J.W.
5df85b37-4091-443d-8907-d49159358ac5
Mackenzie, J.I.
1d82c826-fdbf-425b-ac04-be43ccf12008
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2
6 July 2009
Kim, J.W.
5df85b37-4091-443d-8907-d49159358ac5
Mackenzie, J.I.
1d82c826-fdbf-425b-ac04-be43ccf12008
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2
Kim, J.W., Mackenzie, J.I. and Clarkson, W.A.
(2009)
Influence of energy-transfer-upconversion on threshold pump power in quasi-three-level solid-state lasers.
Optics Express, 17 (14), .
(doi:10.1364/OE.17.011935).
Abstract
A simple analytical expression for threshold pump power in an end-pumped quasi-three-level solid-state laser, which takes into account the influence of energy-transfer-upconversion (ETU), is derived. This expression indicates that threshold pump power can be increased dramatically by ETU, especially in low gain lasers and lasers with pronounced three-level character due to the need for high excitation densities in the upper manifold to reach threshold. The analysis has been applied to an Er:YAG laser operating at 1645 nm in-band pumped by an Er,Yb fiber laser at 1532 nm. Predicted values for threshold pump power as a function of erbium doping concentration are in very good agreement with measured values. The results indicate that very low erbium doping levels (~0.25 at.% or less) are required to avoid degradation in performance due to ETU even under continuous-wave lasing conditions in Er:YAG.
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Published date: 6 July 2009
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Local EPrints ID: 70894
URI: http://eprints.soton.ac.uk/id/eprint/70894
ISSN: 1094-4087
PURE UUID: 17e3f334-d315-4fa3-98e9-3ace660123b7
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Date deposited: 10 Mar 2010
Last modified: 14 Mar 2024 02:44
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J.W. Kim
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