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High-order harmonic generation enhanced by XUV light

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Abstract

The combination of high-order harmonic generation (HHG) with resonant XUV excitation of a core electron into the transient valence vacancy that is created in the course of the HHG process is investigated theoretically. In this setup, the first electron performs a HHG three-step process, whereas the second electron Rabi flops between the core and the valence vacancy. The modified HHG spectrum due to recombination with the valence and the core is determined and analyzed for krypton on the 3d4p resonance in the ion. We assume an 800nm laser with an intensity of about 1014Wcm2 and XUV radiation from the Free Electron Laser in Hamburg (FLASH) with an intensity in the range 10131016Wcm2. Our prediction opens perspectives for nonlinear XUV physics, attosecond x rays, and HHG-based spectroscopy involving core orbitals.

© 2011 Optical Society of America

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Corrections

Christian Buth, "High-order harmonic generation enhanced by XUV light: erratum," Opt. Lett. 48, 435-435 (2023)
https://opg.optica.org/ol/abstract.cfm?uri=ol-48-2-435

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