Abstract: For the transmission of high-power excimer laser radiation in the kilowatt range, a flexible bundle of tapered quartz fibers is presented. Thirty fibers with a tapered coupling section are assembled in a bundle, which is tested with an excimer laser providing 2 J pulse energy at repetition rates of up to 20 pulses per second. The bundle showed good transmission qualities at 308 nm wavelength with an output power of 0.5 J/pulse. Catastrophic damage of fibers or other bundle elements did not occur during irradiation. The transmitted energy remained constant over the energy range tested with short irradiation times and low frequencies and is sufficient for material processing. At present, the transmission efficiency of the bundle is about 25%.!
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