Chirped pulse amplification laser system

A chirped pulse amplification (CPA) pulse laser system comprising:

• a mode-locked laser operative to output near transform limited (TL) sub-nanosecond (sub-ns) pukes having a spectral bandwidth and propagating along a path;
• a first Bragg gratings (BG) spaced downstream from the mode-locked laser and operative to stretch the TL sub-ns pulses coupled into the first BG;
• a second BG spaced downstream from the first BG and operative to recompress the stretched pulses,
• wherein one of the first or second BGs is configured with a plurality of tunable segments corresponding to respective wavelengths of the bandwidth;
• an array of actuators coupled to respective segments;
• and
• a pulse shaping unit operative to determine a deviation of the spectral phase for each wavelength of the bandwidth of the compressed pulse from that of the IL sub-ns pulse, and to output corrective signals coupled into the array of actuators which selectively and controllably induce spectral phase changes on respective segments of the one BG so as to adjust the spectral phase to that of the TL sub-ns pulse.