Extended Data Fig. 2: Efficiency estimation.
From: Extreme-ultraviolet spectral compression by four-wave mixing
XUV spectra have been recorded for a minimal NIR intensity (destructive interference, blue line) and maximal NIR intensity (constructive interference, orange line). In the maximal NIR intensity, the narrow-bandwidth emission at 12.365 eV is observed, together with a decreased spectral intensity in the region between 9.0 eV and 9.64 eV. To estimate efficiencies, the emission (orange shade) and the incident area between 9 eV and 9.64 eV (blue shade) areas are calculated. For more information see Supplementary Information.
