Abstract
We study two-color high-order harmonic generation in Neon with 790 nm and 1300 nm driving laser fields and observe an extreme-ultraviolet continuum that extends to photon energies of 160 eV. Using a 6-mm-long, high pressure gas cell, we optimize the HHG yield at high photon energies and investigate the effect of ionization and propagation under phase-matching conditions that allow us to control the temporal structure of the XUV emission. Numerical simulations that include the 3D propagation of the two-color laser pulse show that a bright isolated attosecond pulse with exceptionally high photon energies can be generated in our experimental conditions due to an efficient hybrid optical and phase-matching gating mechanism.
Highlights
High-order harmonic generation (HHG) is a unique technique allowing the generation of bursts of ultrashort extreme-ultraviolet (XUV) light
We investigate and optimize HHG in Neon exploiting a two-color scheme with driving laser pulses centered at 790 nm and 1300 nm
The laser pulse parameters, cell position and gas pressure were optimized in both cases to generate a maximum harmonic yield
Summary
High-order harmonic generation (HHG) is a unique technique allowing the generation of bursts of ultrashort extreme-ultraviolet (XUV) light. These pulses provide a way to study ultrafast electronic processes in matter on their natural time scale down to the attosecond regime [1, 2]. These studies have been, to a large extent, limited to photon energies below 100 eV. HHG schemes capable of generating stable ultrashort XUV or X-ray pulses with photon energies above 100 eV at high intensity are desirable, since these sources allow the implementation of pump-probe configurations with ultimate time resolution
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