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Since the advent of chirped pulse amplification1 the peak power of lasers hasgrown dramatically and opened the new branch of high field science, deliveringthe focused irradiance, electric fields of which drive electrons into therelativistic regime. In a plasma wake wave generated by such a laser,modulations of the electron density naturally and robustly take the shape ofparaboloidal dense shells, separated by evacuated regions, moving almost at thespeed of light. When we inject another counter-propagating laser pulse, it ispartially reflected from the shells, acting as relativistic flying(semi-transparent) mirrors, producing an extremely time-compressedfrequency-multiplied pulse which may be focused tightly to the diffractionlimit. This is as if the counterstreaming laser pulse bounces off arelativistically swung tennis racket, turning the ball of the laser photonsinto another ball of coherent X-ray photons but with a form extremelyrelativistically compressed to attosecond and zeptosecond levels. Here wereport the first demonstration of the frequency multiplication detected fromthe reflection of a weak laser pulse in the region of the wake wave generatedby the driver pulse in helium plasma. This leads to the possibility of verystrong pulse compression and extreme coherent light intensification. ThisRelativistic Tennis with photon beams is demonstrated leading to thepossibility toward reaching enormous electromagnetic field intensification andfinally approaching the Schwinger field, toward which the vacuum nonlinearlywarps and eventually breaks, producing electron-positron pairs.

Relativistic Tennis with Photons: Demonstration of Frequency Upshifting by a Relativistic Flying Mirror through Two Colliding Laser Pulses