All fiber cascaded ytterbium doped nanosecond pulsed amplifier

A cascaded ytterbium-doped all-fiber master oscillator power amplifier (MOPA) with 1064-nm pulsed laser is demonstrated, and it can produce up to 20-W average power and 0.1-mJ pulse energy at tunable repetition rates from 10 to 200 kHz. Two main di±culties of the all-fiber configuration are overcome