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  1. High intensity, laser solid interactions are capable of generating attosecond light bursts via high harmonic generation, most work focuses on single beam interactions. In this study, we perform a numerical investigation on the role of wavelength and polarization in relativistic, high harmonic generation from normal-incidence, two-beam interactions off plasma mirrors. We find that the two-beam harmonic generation mechanism is a robust process described by a set of well-defined selection rules. We demonstrate that the emitted harmonics from normal incidence interactions exhibit an intensity optimization when the incident fields are of equal intensity for two-color circularly-polarized fields. 
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    Free, publicly-accessible full text available July 1, 2024
  2. Generation of an extreme ultraviolet continuum (33 eV to 72 eV) by a multi- millijoule, few-cycle (7 fs) laser pulse produced by the Thin Film Compression technique. 
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  3. Abstract

    While nearly all investigations of high order harmonic generation with relativistically intense laser pulses have taken place at 800 or 1053 nm, very few experimental studies have been done at other wavelengths. In this study, we investigate the scaling of relativistic high harmonic generation towards longer wavelengths at intensities ofa0 ∼ 1. Longer driver wavelengths enable enhanced diagnostics of the harmonic emission, as multiple orders lie in the optical regime. We measure the conversion efficiency by collecting the entire harmonic emission as well as the divergence through direct imaging. We compare the emission with 2D particle-in-cell simulations to determine the experimental target conditions. This new regime of high order harmonic generation also enables relativistic scaling as well as improved discrimination of harmonic generation mechanisms.

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