Generation and control of Doppler harmonics approaching $10^{22}{\text{W/cm}}^2$ on plasma mirrors

Baptiste Groussin, Philipp Sikorski, Aodhan McIlvenny +12

In this letter, we report Doppler harmonic generation with a relativistic plasma mirror at unprecedented intensities $>10^{21}{\text{W/cm}}^2$ using a PetaWatt-class laser. We sh…