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Narrowband High Harmonic Source with Multi-mW Average Power Based on Cascaded Frequency Conversion

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Abstract

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.

© 2016 Optical Society of America

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