Fig. 1: Continuously tunable experimental HHG spectra within >2 eV range.
From: Bright continuously tunable vacuum ultraviolet source for ultrafast spectroscopy
The spectrum of the 7th harmonic tunable in the range from 20 eV to 22 eV generated in a Kr gas target (a) by the second harmonic of the IR laser (b). The spectra are vertically offset for clarity.
