Flashlamp-pumped high-gain fiber-bundle lasers consisting of multimode phosphate glass fibers have been investigated. By optimizing the fiber number and the outcoupling reflectivity in dependence on the pump conditions, high single-pulse energies in excess of 1 J as well as high-average-power extraction up to 100 W at a pulse repetition frequency of 100 Hz could be obtained from slim fiber-bundle lasers. Fiber numbers in the range of 150–250 and reflectivities between 35% and 50% have been found to provide reliable performance.
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Koch, R., Griebner, U. & Grunwald, R. High-average-power flashlamp-pumped Nd:Glass fiber-bundle laser. Appl. Phys. B 58, 403–407 (1994). https://doi.org/10.1007/BF01081881