The change of the pulse width and the chirp with the saturable absorption and the gain band-width of Q-switched mode-locked lasers by means of the temporal domain ABCD matrices-is discussed.

• 用时域ABCD矩阵讨论了调Q锁模脉冲激光器输出脉冲的宽度和啁啾特性 ；主要给出了调Q元件作为幅度调制元件时的时域ABCD矩阵 ；并将光脉冲在激光腔中往返一周的ABCD矩阵写出 ；用此矩阵讨论了它对锁模脉冲的影响 .