25 February 2008 High-power, fiber-coupled stack arrays for pump applications
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Abstract
Here we present details of the design and performance of a family of compact, fiber-coupled, multi-bar, laser-diode stacks. The highest-power variant employs a pair of 6-bar stacks and a removable 400-μm, 0.22 NA fiber to deliver >400 W at 50 A. The overall power conversion efficiency (PCE) near 976-nm exceeds 40% at 400 W in CW operation with an uncoated delivery fiber. The brightest variant reaches a power density near 800-kW/cm2 at 976-nm through a 200-μm, 0.22 NA fiber. Module variants have been built and characterized at multiple wavelengths between 780-nm and 980-nm. Applications for such modules include pumping of active fibers, pumping of rubidium vapor and direct material processing.
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O. Romero, O. Romero, C.-H. Chen, C.-H. Chen, J. Harrison, J. Harrison, T. Towe, T. Towe, S. Ginter, S. Ginter, H. Li, H. Li, I. Chyr, I. Chyr, J. Johnson, J. Johnson, J. Egan, J. Egan, K. Dinh, K. Dinh, } "High-power, fiber-coupled stack arrays for pump applications", Proc. SPIE 6876, High-Power Diode Laser Technology and Applications VI, 687611 (25 February 2008); doi: 10.1117/12.764039; https://doi.org/10.1117/12.764039
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