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Resonances in the photo-absorption spectrum of the generating medium canmodify the spectrum of high order harmonics. In particular, window-type Fanoresonances can reduce photo-absorption within a narrow spectral region and,consequently, lead to an enhanced emission of high-order harmonics inabsorption-limited generation conditions. For high harmonic generation in argonit is shown that the 3s3p6 np 1P1 window resonances (n=4,5,6) give rise toenhanced photon yield. In particular, the 3s3p6 4p 1P1 resonance at 26.6 eVallows a relative enhancement up to a factor of 30 compared to thecharacteristic photon emission of the neighboring harmonic order. Thisenhanced, spectrally isolated and coherent photon emission line has a relativeenergy bandwidth of only {\Delta}E/E=3*10-3. Therefore, it might be directlyapplied for precision spectroscopy or coherent diffractive imaging without theneed of additional spectral filtering. The presented mechanism can be employedfor tailoring and controlling the high harmonic emission of manifold targetmaterials.

Enhancing narrowband high order harmonic generation by Fano resonances