“…For applications requiring more energetic pulses or higher average power, the laser oscillator output can be further amplified using a laser amplifier in various configurations involving regenerative amplifier (Luhrmann, 2009), zigzag slab geometry (Cui, 2009;Fu, 2010), multiple amplification media (Fu, 2009), or hybrid fiber and solid-state system (Wushouer, 2010). These configurations are usually based on Nd:YAG or Nd:YVO 4 active materials with concentrations below 1 at.%.…”