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用傅里叶变换的方法分析了锁模激光器中模式间的相位和振幅涨落对锁模脉冲列特性的影响。将锁模激光器中各模式的相位和振幅涨落作傅里叶展开,再通过增益谱抽样的傅里叶变化得到其时域行为。分析结果表明振幅系统涨落及随机涨落均不引起脉宽的明显变化,只引起脉冲间背景的加大,但相位涨落随机会使脉冲列强度产生波动。所用物理图像简明,结果对获得稳定的锁模脉冲列的实验研究有参考意义。
The effect of the phase and the amplitude fluctuation between the modes in the mode-locked laser on the characteristics of mode-locked pulse trains was analyzed by Fourier transform. The phase and amplitude fluctuation of each mode in the mode-locked laser are Fourier expanded, and the Fourier transform of the gain spectrum sampling is used to obtain the time domain behavior. The analysis results show that both amplitude fluctuation and random fluctuation do not cause obvious change of pulse width, and only cause the background between pulses to increase. However, the phase fluctuation randomly causes the fluctuation of pulse train intensity. The physical images used are concise, and the results are of reference for the experimental study of obtaining stable mode-locked pulse trains.