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Fill, E.; Pupeza, I.; Holzberger, S.; Carstens, H.; Lilienfein, N.; Apolonski, A. and Krausz, Ferenc ORCID logoORCID: https://orcid.org/0000-0002-6525-9449 (2016): Coherent Soft-X-Ray Pulses at Multi MHz Repetition Rates Using Enhancement Cavities. In: Rocca, Jorge (ed.) : X-Ray Lasers 2014: Proceedings of the 14th International Conference on X-Ray Lasers. Springer Proceedings in Physics, Vol. 169. Springer. pp. 179-186

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Enhancement cavities are passive optical resonators which allow increasing the power of multi-MHz pulse trains by orders of magnitude. Generating high harmonics from enhanced pulses of an Yb-laser (λ = 1040 nm) coherent XUV pulses with wavelengths down to 11.5 nm (108 eV) were obtained at a repetition rate of 78 MHz. Harmonics were coupled out of the cavity by a small hole in a mirror. With up to 5 kW of fundamental laser power in the cavity, average powers of 5.4 mu W and 8 pW were measured at 38 and 11.5 nm respectively. New developments include scaling of fundamental laser powers in a cavity up to 670 kW and efforts aiming at the generation of attosecond pulses with multi-MHz repetition rates.

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