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Laser pulse compression gratings are very useful optical components for systems delivering ultrashort pulses in ps and fs regions. With a duration less than 1 ps and pulse energy around 1 J, the involved ultrashort pulses could generate super high peak power. Robust components are required to withstand the high peak optical power and pulse compression gratings come as a critical part for solving this problem. The strategy is to stretch out or chirping the initial input pulse in such a way that peak powers are greatly reduced (so that they can safely be amplified), and then recompress the long, lower-power pulses back to the original width, or possibly even shorter. This is the so-called chirped pulse amplification technique and with this method, it is possible to obtain terawatt level pulses as short as 80 ps.