Low repetition rate broadband high energy and peak power nanosecond pulsed Yb do

We demonstrate a broadband fiber amplifier system emitting 10 nm pulses with 33 mj pulse energy at repetition rates between 1 and 20 Hz. In combination with a pulse width of 10 ns, a corresponding peak output power over than 3 MW was achieved. This record performance was enabled by fiber with core diameter of 200 mu m. Furthermore, in order to suppress amplified spontaneous emission (ASE), multistage pulse pump technology was applied and different pumping characteristics had been measured. Final