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We present the design and performance of a narrow linewidth single frequency 2039 nm distributed feedback (DFB) fiber Bragg grating (FBG) fiber laser source with a novel optical pumping configuration at 1567 nm that significantly increases optical-optical pump conversion efficiency. Our new configuration employs an optical circulator and a reflector at 1567 nm to efficiently recycle pump light that is not absorbed in the first pass through the FBG-DFB fiber laser. We report a comparison of simulations with experimental results for the novel high efficiency single frequency 2039 nm Tm-doped fiber laser source.
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