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Narrowband high harmonic source with multi-mW average power based on cascaded frequency conversion

: Demmler, S.; Klas, R.; Tschernajew, M.; Hädrich, S.; Rothhardt, J.; Limpert, J.; Tünnermann, A.


Optical Society of America -OSA-, Washington/D.C.:
International Conference on Ultrafast Phenomena 2016 : Santa Fe, New Mexico United States, 17-22 July 2016
Washington, DC: OSA, 2016
ISBN: 978-1-943580-18-7
Paper UW2B.6
International Conference on Ultrafast Phenomena (UP) <20, 2016, Santa Fe/NM>
Fraunhofer IOF ()

We report on efficient high harmonic generation based on cascaded frequency conversion of a high power femtosecond fiber laser. Using krypton as generation medium, up to 2.8 mW (8·1014 photons/s) of average power have been generated within a single narrowband harmonic at 21.6 eV. Furthermore, a strong window-resonance in argon has been utilized to achieve relative energy bandwidths of ΔE/E=3·10−3 at 26.6 eV. This narrow harmonic line still contains 1.6 mW of average power. We discuss the scaling towards higher photon flux, smaller bandwidth and potential applications.