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首次利用ＧａＡｓ光电导开关构成的反馈回路，正、负反馈联合作用，动态控制Ｎｄ：ＹＬＦ被动锁模激光器腔内的Ｑ值，得到高能量、长序列的稳态锁模脉冲．稳态单脉冲的脉宽为４ｐｓ，能量为９μＪ，脉冲序列长１６μｓ，能量为２．５ｍＪ．
For the first time, a feedback loop composed of GaAs photoconductive switches is used to control the Q value of the Nd: YLF passive mode-locked laser cavity dynamically by the combined action of positive and negative feedback to obtain a high-energy long sequence of mode-locked pulses. The steady-state single pulse has a pulse width of 4 ps, an energy of 9 μJ, a pulse sequence of 16 μs and an energy of 2.5 mJ.