Mid-Infrared High-order Laser-Plasma Interactions in Solids

Relativistic laser-solid interactions are capable of driving high energy electron, ion, and x-ray emission. Despite favorable scalings towards longer wavelength, most solid high-order harmonic generation experiments have been with near-infrared lasers. High-energy, longer-wavelength experiments are now capable of driving such interactions enabling enhanced diagnostics. We report an in depth investigation of these interactions at 1.3 and 2.1 micron wavelengths, with supporting Particle-in-Cell simulations.