Mid-Infrared High-order Laser Plasma Interactions in Solids

Relativistic laser-solid interactions are capable of accelerating high energy electron, ion, and x-ray beams. Most solid high-order harmonic generation experiments to date have been with near-infrared lasers despite scalings which are strongly wavelength dependent. With the advent of high energy optical parametric amplifiers, relativistically intense short pulse mid-infrared experiments are now possible. We report the first results of radiation production from these interactions, with supporting Particle-in-Cell simulations.