Abstract
In this paper, we report a high-power thulium (Tm)-doped superfluorescent fiber source (SFS) in the 2-μm 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 ~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 ~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 ~2 μm SFS in Tm-doped silica fibers pumped at ~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.
Highlights
Superfluorescent fiber sources (SFSs) have the advantages of broad emission spectra, high output powers, high overall conversion efficiencies, and excellent spatial coherence [1, 2]
In the past few years, rapid progress has been made in scaling of the amplified spontaneous emission (ASE) output
We report a simple approach for scaling of the output power from a Tm-doped superfluorescent fiber source (SFS) using a singlestage configuration in combination with a double anglecleaved facet geometry to reduce the feedback from the fiber-end facets and provide effective suppression of the
Summary
Superfluorescent fiber sources (SFSs) have the advantages of broad emission spectra, high output powers, high overall conversion efficiencies, and excellent spatial coherence [1, 2]. The combination of these characteristics makes SFSs suitable for applications in rotation sensing, pumping of Raman lasers, medical imaging, and optical coherence domain reflectometry [3, 4]. The main drawback of the MOPA scheme is that it is rather complex It requires two kinds of fibers (and their associated pump sources) and one or more Faraday isolators to provide the required degree of attenuation of feedback to both the seed and the amplifier. It is not easy to realize an all-fiber SFS for a MOPA scheme because of the destructive effect of the strong backward ASE on the pump source and the other optical components
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