19 February 2018 Efficient pump module coupling >1kW from a compact detachable fiber
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Proceedings Volume 10514, High-Power Diode Laser Technology XVI; 105140K (2018) https://doi.org/10.1117/12.2288468
Event: SPIE LASE, 2018, San Francisco, California, United States
Abstract
In the most developed fiber amplifiers, optical pump power is introduced into the ~400μm-diameter, 0.46NA first cladding of the double-clad, Yb-doped, gain fiber, using a (6+1):1 multi-mode fiber combiner. For this configuration, the core diameter and numerical aperture of the pump delivery fibers have maximum values of ~225μm and ~0.22, respectively. This paper presents the first fiber-coupled laser-diode pump module emitting more than 1kW of claddingmode- stripped power from a detachable 225μm, 0.22NA delivery fiber at 976nm. The electrical-to-optical power conversion efficiency at 1kW is ~50%. The FWHM spectral width at 1kW output is ~4nm and has an excellent overlap with the narrow absorption spectrum of ytterbium in glass. Six of these pump modules attached to a (6+1):1 multimode combiner enable a 5-6kW, single-mode, Yb-doped fiber amplifier.
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M. Dogan, R. H. Chin, S. Fulghum, J. H. Jacob, A. K. Chin, "Efficient pump module coupling >1kW from a compact detachable fiber", Proc. SPIE 10514, High-Power Diode Laser Technology XVI, 105140K (19 February 2018); doi: 10.1117/12.2288468; https://doi.org/10.1117/12.2288468
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