Tunable high harmonic generation with an optical parametric amplifier
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A high-intensity 1014 W/cm2 optical parametric amplifier (OPA) was developed to generate tunable infrared pulses for high harmonic generation (HHG). The HHG experiments with xenon and argon gases using the OPA output were performed with a kHz gas valve. The tunable nature of the OPA led to tunable HHG, resulting in a source of fully tunable coherent XUV radiation from 0.22 μm to the HHG cutoff. Compared with the conventional 800 nm (Ti:sapphire) driving field, increasing the driving wavelength by an OPA also significantly extended the cutoff photon energy of the HHG.