Abstract

A multi-terawatt, ultra-short laser pulse was used to create alarge, well-defined relativistic ionization front, and thecollision of a probe laser pulse with it was studied. Due to thegood definition of the ionization front it was also possible toisolate the probe frequency up-shift due to the collision, unlikein previous experiments. A good agreement with the theoreticalmodel for photon acceleration was found. Furthermore, we reportnovel measurements of ionization front velocities, based on thephoton acceleration effect, in excess of 0.99c.

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