Effects of energy-transfer up-conversion and excited-state absorption in quasi-three-level Nd:GdVO4 lasers

We investigate in detail the effect of energy-transfer up-conversion (ETU) and excited-state absorption (ESA) in diode-end-pumping quasi-three-level Nd:GdVO 4 lasers. The energy levels of Nd:GdVO 4 crystals and the rate equation involving ETU and ESA effects are presented. The results of simulation...

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Bibliographic Details
Published in:Journal of Russian laser research 2009-07, Vol.30 (4), p.376-383
Main Authors: Gao, J., Yu, X., Yan, R. P., Gu, H. D., Zheng, C. Q., Wu, X. D., Wei, B., Chen, F., Li, X. D.
Format: Article
Language:English
Subjects:
Cross sections
Equivalence
Excitation
Lasers
Mathematical analysis
Microwaves
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Pumps
RF and Optical Engineering
Simulation
Upconversion
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Summary:We investigate in detail the effect of energy-transfer up-conversion (ETU) and excited-state absorption (ESA) in diode-end-pumping quasi-three-level Nd:GdVO 4 lasers. The energy levels of Nd:GdVO 4 crystals and the rate equation involving ETU and ESA effects are presented. The results of simulation show that the ETU effect is important in quasi-three-level lasers and can provide heating approximately two times higher than that induced by the ESA. Moreover, the relationship between the incident pump power and the 912 nm output power was simulated taking into account the ESA; a comparison with experimental data is also presented. As a result, we conclude that the ESA plays an important role in the high-power pumping field; the estimated equivalent cross-section σ ESA = (1.0 ± 0.5) ∙ 10 −20 cm 2 .
ISSN:1071-2836
1573-8760
DOI:10.1007/s10946-009-9083-0