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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 14 — Jul. 6, 2009
  • pp: 11935–11943

Influence of energy-transfer-upconversion on threshold pump power in quasi-three-level solid-state lasers

J. W. Kim, J. I. Mackenzie, and W. A. Clarkson  »View Author Affiliations

Optics Express, Vol. 17, Issue 14, pp. 11935-11943 (2009)

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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.


OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3430) Lasers and laser optics : Laser theory
(140.3500) Lasers and laser optics : Lasers, erbium
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.3613) Lasers and laser optics : Lasers, upconversion

ToC Category:
Lasers and Laser Optics

Original Manuscript: April 21, 2009
Revised Manuscript: May 29, 2009
Manuscript Accepted: June 16, 2009
Published: June 30, 2009

J. W. Kim, J. I. Mackenzie, and W. A. Clarkson, "Influence of energy-transfer-upconversion on threshold pump power in quasi-three-level solid-state lasers," Opt. Express 17, 11935-11943 (2009)

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