Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 118, Issue 1, Pages 101-107Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-014-5959-y
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Funding
- National Natural Science Foundation of China [61307057]
- State Key Laboratory of Tribology, Tsinghua University, China [SKLT12B08]
- China Postdoctoral Science Foundation [2012M520258, 2013T60109]
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In this paper, we report a high-power thulium (Tm)-doped superfluorescent fiber source (SFS) in the 2-mu m spectral region. The SFS is based on double angle-cleaved facet operation and uses a simple single-stage geometry. The copropagating amplified spontaneous emission (ASE) yields a maximum output of 20.7 W at a center wavelength of 1,960.7 nm, with a full width at half maximum (FWHM) of similar to 45 nm. The counterpropagating ASE yields a maximum output of 25.2 W at a center wavelength of 1,948.2 nm, with a FWHM of similar to 50 nm. The maximum combined output of the SFS is as much as 45.9 W, which corresponds to a slope efficiency of 38.9 %. In addition, a model of the similar to 2 mu m SFS in Tm-doped silica fibers pumped at similar to 790 nm is developed, and the influence of fiber length and end-facet reflectivity on the ASE output performance and the parasitic lasing threshold are studied numerically.
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