High pulse energy, high repetition picosecond chirped-multi-pulse regenerative amplifier laser

► We first got the pulses width stretched from ∼10 ps to ∼100 ps with only a single grating. ► We first used the chirped-multi-pulse regenerative amplifier technology.► By regeneration amplifier system, the output energy was about 28 mJ at the repetition rate of 1 KHz and 112.1 ps in single pulse width. ► A pulse sequence with each of five pulses per group was obtained with a pulse width of 28 ps and 14 mJ in each group at a repetition rate of 1 KHz.