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对自倍频(SFD)效应在半导体可饱和吸收镜(SESAM)锁模激光器中抑制调Q倾向的机制进行了详细的理论研究和数值模拟。推导了含有自倍频效应的SESAM锁模激光器中非线性损耗的表达式。建立了描述激光器内脉冲能量变化的方程组。用微扰法分析了锁模激光器的稳定性条件,证明了适当强度的自倍频效应能够抑制激光器的调Q倾向,降低稳定锁模的阈值。用计算机仿真模拟了锁模激光器在有无自倍频效应时的特征,验证了理论推导的结论。
The mechanism of self-frequency-doubling (SFD) suppression of Q-switched in the SESAM mode-locked laser is studied theoretically and numerically. The expression of nonlinear loss in SESAM mode-locked laser with self-double frequency effect is deduced. A system of equations describing the variation of the pulse energy in the laser is established. The perturbation method is used to analyze the stability of the mode-locked laser. It is shown that the self-frequency doubling effect of proper intensity can restrain the Q-switched tendency of the laser and reduce the threshold of stable mode-locking. The characteristics of the mode-locked laser with or without self-doubling effect were simulated by computer simulation, and the conclusion of the theoretical derivation was verified.