Table-top soft x-ray source for XAS experiments with photon energies up to 350 eV
arxiv(2024)
摘要
We present a table-top setup for femtosecond x-ray absorption spectroscopy
based on high harmonic generation (HHG) in noble gases. Using sub-millijoule
pump pulses at a central wavelength of 1550 nm broadband HHG in the range 70 to
350 eV was demonstrated. The HHG coherence lengths of several millimeters were
achieved by reaching the nonadiabatic regime of harmonic generation. NEXAFS
experiments on the boron K edge of a boron foil and a hexagonal BN (hBN) 2D
material demonstrate the capabilities of the setup.
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