But the life time of krf laser medium is only 2 ns while the pump time of e - beam pump krf laser is over 100 ns . when a 1 ps ultrashort pulse amplified by krf laser amplifier most pump energy is waste . technology of multi pulse amplify can solve this problem Krf激光器的工作介质是非储能介质，上能态有效寿命约为2 - 3ns ，而电子束的泵浦时间一般为上百ns ，放大超短脉冲激光时绝大部分上能态的储能没有被利用。
