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Power scaling of femtosecond enhancement cavities and high-power applications

: Pupeza, I.; Eidam, T.; Kaster, J.; Bernhardt, B.; Rauschenberger, J.; Ozawa, A.; Fill, E.F.; Udem, T.; Kling, M.F.; Limpert, J.; Alahmed, Z.A.; Azzeer, A.M.; Tünnermann, A.; Hänsch, T.W.; Krausz, F.


Dawson, J.W. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers VIII: Technology, Systems, and Applications : 22.-26.1.2011, San Francisco, California, USA, SPIE Photonics West
Bellingham, WA: SPIE, 2011 (Proceedings of SPIE 7914)
ISBN: 978-0-8194-8451-2
Paper 79141I
Conference "Fiber Lasers - Technology, Systems, and Applications" <8, 2011, San Francisco/Calif.>
Conference Paper
Fraunhofer IOF ()
enhancement cavity; XUV; MHz high-harmonic generation

An Yb-based 78-MHz repetition rate fiber-amplified frequency comb is used to investigate the power scaling limitations of a standard-design bow tie high-finesse enhancement cavity for XUV generation. With a Xenon gas jet in the 22-?m-radius focus, the 200-fs intra-cavity circulating pulse reaches a maximum of 20 kW of time-averaged power. A novel cavity design is presented, conceived to overcome the observed enhancement limitations and offering the prospect of few-nm high-power high-harmonic generation. Several applications which come into reach for the first time are discussed.