Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

An output energy of 1.1 J of amplified nanosecond pulses was obtained by utilizing a diode-pumped Yb:YAG laser amplifier with the crystal cooled to 125 K. An all-mirror relay imaging was implemented to accomplish a low loss multi-pass scheme, where a three dimensional folding compensates the astigmatism of spherical mirrors at non-normal incidence. Without the need of diode-wavelength stabilization a for this type of amplifier record high total diode output to amplifier efficiency of 45 % was achieved.