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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 µm core Yb-doped large mode area fiber with a seed pulse energy of 0.75 mJ and pulse duration of 11 ns. No stimulated Brillouin scattering, stimulated Raman scattering or saturation are observed. Furthermore, higher pulse energies will be achieved with higher pump powers.