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采用数值分析的方法研究了光纤激光器中类噪声脉冲的自相关特性。数值计算的结果复现了实验中观测到的类噪声自相关曲线图形。进一步改变类噪声脉冲各参量设置,发现无背景强度自相关曲线的基底和尖峰的宽度分别反映了类噪声脉冲波包的宽度以及类噪声脉冲波包中超短脉冲的平均脉宽。相同的类噪声脉冲波包中超短脉冲的个数越多,无背景强度自相关曲线的尖峰与基底的峰值比越小,尖峰与基底的宽度则不受影响。对类噪声脉冲干涉自相关曲线的数值研究结果表明,实验中测量得到的峰值背景比小于8∶1的干涉自相关曲线,是类噪声脉冲波包宽度、类噪声脉冲啁啾、自相关仪扫描范围共同影响的结果。
The auto-correlation characteristics of noise-like impulses in fiber lasers are studied numerically. The numerical results reproduce the observed noise-like autocorrelation curves in the experiment. By further changing the parameters of the noise-like pulse, it is found that the width of the base and the peak without the background autocorrelation curve respectively reflect the width of the noise-like pulse packet and the average pulse width of the ultrashort pulse in the noise-like pulse packet. In the same kind of noise-like pulse packet, the more the number of ultrashort pulses, the smaller the peak-to-base peak ratio of the non-background intensity autocorrelation curve is, and the peak and the width of the substrate are unaffected. The numerical results of the noise-like interference auto-correlation curve show that the interference auto-correlation curve with the peak background ratio of less than 8: 1 is the noise-like pulse width, the noise-like pulse chirp, the autocorrelator The result of the common influence of the range.