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Generation of coherent sub-20 nm XUV radiation at 78 MHz via cavity-based HHG

: Pupeza, I.; Holzberger, S.; Eidam, T.; Esser, D.; Weitenberg, J.; Carstens, H.; Rußbüldt, P.; Limpert, J.; Udem, T.; Tünnermann, A.; Hänsch, T.W.; Krausz, F.; Fill, E.


Chergui, M. ; Ecole Polytechnique Federale de Lausanne -EPFL-:
XVIIIth International Conference on Ultrafast Phenomena 2012 : Lausanne, Switzerland, July 8-13, 2012
Les Ulis: EDP Sciences, 2013 (EPJ Web of Conferences 41.2013)
ISBN: 978-2-7598-0956-1
Art. 10023, 3 pp.
International Conference on Ultrafast Phenomena (UP) <18, 2012, Lausanne>
Conference Paper
Fraunhofer ILT ()
Fraunhofer IOF ()

We present two major advances of enhancement-cavity-based high-order harmonic generation (HHG). First, the generated extreme ultraviolet (XUV) radiation is coupled out collinearly through an on-axis opening in the mirror following the HHG focus. This minimizes the interaction of both the fundamental and the intracavity generated ra diation with the output coupler while simultaneously enabling a large enhancement and an output coupling efficiency that increases with the harmonic order. Second, we use the nonlinearly compressed pulses of an Yb-based laser to drive intracavity HHG allowing for a unique power regime combining short pulses with high average powers. Together, these advances overcome fundamental limitations of current enhancement cavity setups and extend intracavity HHG towards higher photon energies. In a proof-of-principle experiment we use a 3-kW and 78-MHz train of 54-fs to generate and couple out coherent sub-20 nm radiation.