A high-power, Joule-class, nanosecond temporally shaped multi-pass ring laser amplifier system with two neodymium-doped phosphate glass (Nd:glass) laser heads is demonstrated. The laser amplifier system consists of three parts: an all-fiber structure

Thermal profile modification of an active material in a laser amplifier via optical pumping results in a change in the material’s refractive index, and causes thermal expansion and stress, eventually leading to spatial phase aberrations, or even perm

A high-efficiency joule-class diode-pumped Nd:YAG active-mirror amplifier was demonstrated. By using four elastically held Nd:YAG slabs as the active medium, we achieved a stable operation with an output pulse energy of 2.3 J at a repetition rate of