Focusing and up-shift of laser light by relativistic flying mirrors in the high power and large wavelength difference regime

Ultra-high power laser pulses propagating in plasma generate breaking plasma waves, relativistic flying mirrors. Lasers counter-propagating to them are reflected, up-shifted and compressed. Using 2D particle-in-cell simulations we show that the source pulse can significantly modify the mirrors at high intensity and that harmonics are generated when both pulses have the same intensity.59th Annual Meeting of the APS Division of Plasma Physic