The structure of active mirror Nd…glass laser amplifier is presented,which is pumped by Xe-lamps.The gain characteristics and energy extraction of the active mirror Nd…glass laser amplifier are experimentally studied.The size of Nd…glass is 380 mm×160 mm×30 mm,and the doping concentration of Nd:glass is 2.2%(mass fraction).Experimental results show that when the charging voltage is 23 kV,the small signal gain coefficient of the system is 0.056 cm-1,and the energy storage efficiency is 2.0%.The spot size of ...