Stable and near Fourier-transform-limit 30fs pulse compression with a tiled grating compressor scheme.

The fabrication of meter-sized-gratings limits the rapid development of worldwide femtosecond ultra-intense lasers with 10PW or higher peak power, and the grating tiling method is an alternative to this problem. But the unreliability and complexity of the traditional grating tiling, which has already been widely used in picosecond Petawatt lasers, challenges its application in femtosecond ultra-intense lasers for wider bandwidth and more sensitive grating attitude. In this paper, we demonstrate an experiment to compress an 800nm centered nanosecond deep-chirped-pulse to around 30fs by an object-image-grating self-tiling compressor, to the best of our knowledge, which is the shortest pulse compressed by a tiled grating compressor. Both the compression pulse and the focal spot are stable and close to the theoretical limits. We believe it is a feasible solution to the grating-size-limited problem for recent femtosecond 10PW Ti:sapphire or OPCPA laser projects.