Utilizing relativistic mirrors for photon-photon scattering

光子ー光子散乱のための相対論鏡の利用

Koga, J. K.; Bulanov, S. V.; Esirkepov, T. Z.; Pirozhkov, A. S.; 神門 正城; Rosanov, N. N.*

Koga, J. K.; Bulanov, S. V.; Esirkepov, T. Z.; Pirozhkov, A. S.; Kando, Masaki; Rosanov, N. N.*

Photon-photon scattering is a fundamental theoretical prediction of quantum electrodynamics. However, only an upper bounds on the cross section at photon energies of eV levels has been achieved. Since for low photon energies the scattering cross section increases as the sixth power of the photon energy, measuring photon-photon scattering at higher energies is advantageous. To generate these high energy photon beams we propose using laser pulses reflected and frequency up-shifted by mirrors moving at relativistic velocities. The reflected laser pulses due to the double Doppler effect can have high energy, extremely short duration, coherency and can be focused to very small spots. We present the scalings of the photon-photon scattering for each relativistic mirror configuration and show where photon-photon scattering in the keV photon energy range could be observed with current/near future and next generation laser systems.