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利用两片半导体可饱和吸收镜(SESAM)实现了稳定的被动锁模激光运转,获得了比单SESAM连续波锁模脉宽更窄、长时间运转稳定性更高的皮秒脉冲。理论上利用分步傅里叶变换法数值求解描述饱和吸收体被动锁模动力学过程的Haus主方程,模拟了双SESAM被动锁模的脉冲演化过程,分析了锁模激光脉冲形成过程与双SESAM可饱和吸收损耗系数q1和q2的关系,并计算得到了锁模脉冲宽度和锁模稳定区域等参数。计算结果与实验结果较为吻合。
A stable passively mode-locked laser is achieved by using two SESAMs, and a picosecond pulse with narrower pulse width and longer running stability than a single SESAM continuous-wave mode-locked laser is obtained. In theory, the Hausdorff equation describing the passive mode-locking dynamic process of saturated absorber is numerically solved by using the step-by-step Fourier transform method to simulate the pulse evolution process of double SESAM passive mode-locking. The formation process of mode-locked laser pulse and the double SESAM Saturable absorption loss coefficient q1 and q2 relationship, and calculated the mode-locked pulse width and the stability of the mode-locked region and other parameters. The calculated results are in good agreement with the experimental results.