Abstract
We report on the experimental realization of the peak intensity scaling technique. Coherent combining of relativistic-intensity femtosecond laser pulses is demonstrated for the first time. The original stabilization setup developed by us provides 100 Hz stabilization bandwidth and a 85 mrad root mean square relative phase instability of amplified pulses which enables as high as 93 % efficiency of coherent beam combining under tight focusing. The peak intensity scaling from 3 × 1019 W/cm2 for the two individual beams to 1.15 × 1020 W/cm2 for the combined beam is achieved using a f/1.2 parabolic mirror. A Strehl ratio of about 0.5 is experimentally obtained without any wavefront correction setup. Currently, it is this work that demonstrates coherent combining of femtosecond pulses with the record pulse parameters, namely with simultaneously the highest peak intensity, highest peak power, highest energy, and shortest duration.
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