By using adaptive optics to correct the wave-front distortion of a 21-fs, 0.7-mJ, 1-kHz laser, we are able to focus the pulses to a 1-μm spot with an f/1 off-axis parabolic mirror. The peak intensity at the focal position is 1.5×10<sup>18</sup> W/cm<sup>2</sup> , which is to the authors' knowledge the first demonstration of generating relativistic intensity at a kilohertz repetition rate.
© 2000 Optical Society of America
O. Albert, H. Wang, D. Liu, Z. Chang, and G. Mourou, "Generation of relativistic intensity pulses at a kilohertz repetition rate," Opt. Lett. 25, 1125-1127 (2000)