Influence of energy-transfer-upconversion on threshold pump power in quasi-three-level solid-state lasers
- Title
- Influence of energy-transfer-upconversion on threshold pump power in quasi-three-level solid-state lasers
- Author
- 김지원
- Keywords
- ND-YLF; YAG; ER; NM
- Issue Date
- 2009-07
- Publisher
- OPTICAL SOC AMER
- Citation
- OPTICS EXPRESS, v. 17, No. 14, Page. 11935-11943
- 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 (similar to 0.25 at.% or less) are required to avoid degradation in performance due to ETU even under continuous-wave lasing conditions in Er:YAG. (C) 2009 Optical Society of America
- URI
- https://www.osapublishing.org/oe/abstract.cfm?uri=oe-17-14-11935https://repository.hanyang.ac.kr/handle/20.500.11754/76214
- ISSN
- 1094-4087
- DOI
- 10.1364/OE.17.011935
- Appears in Collections:
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > PHOTONICS AND NANOELECTRONICS(나노광전자학과) > Articles
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