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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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2009-07-06.
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| Online Access: | Get fulltext |
| LEADER | 01345 am a22001453u 4500 | ||
|---|---|---|---|
| 001 | 70894 | ||
| 042 | |a dc | ||
| 100 | 1 | 0 | |a Kim, J.W. |e author |
| 700 | 1 | 0 | |a Mackenzie, J.I. |e author |
| 700 | 1 | 0 | |a Clarkson, W.A. |e author |
| 245 | 0 | 0 | |a Influence of energy-transfer-upconversion on threshold pump power in quasi-three-level solid-state lasers |
| 260 | |c 2009-07-06. | ||
| 856 | |z Get fulltext |u https://eprints.soton.ac.uk/70894/1/j.pdf | ||
| 520 | |a 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. | ||
| 655 | 7 | |a Article | |