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. 2020 Jan 31;7(1):014303. doi: 10.1063/1.5131216

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© 2020 Author(s).

2329-7778/2020/7(1)/014303/10

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FIG. 5. — Fermi edge measured at 40 K for different laser repetition rates and photon energies. (a) Fermi edge at 16.9 eV (7th harmonic) measured at 50, 100, and 200 kHz repetition rate; (b) Fermi edge at 16.9 eV, 200 kHz, varying the energy per pulse of the driving laser; (c) 7th harmonic energy bandwidth measurement. Square black dots: experimental data. Solid blue line: fitting curve used to extract the FWHM; (d) Fermi edge at 21.7 eV (9th harmonic) measured at 50, 100, 200 kHz repetition rate; (e) Fermi edge at 21.7 eV, 200 kHz, varying the energy per pulse of the driving laser; (f) 9th harmonic energy bandwidth measurement.