A 12 mJ 11 ns spectrally narrow fiber amplifier with a pulsed pump

We report on the fiber-based amplification of a flash lamp pumped Q-switched Nd:YAG laser. At a repetition rate of 10 Hz and spectrum width of 0.1 nm, an output single pulse energy of up to 12 mJ is generated in a 95 mu m core Yb-doped large mode area fiber with a seed pulse energy of 0.75 mJ and pu