激光与光电子学进展, 2015, 52 (12): 121902, 网络出版: 2015-12-08
光纤激光器中类噪声脉冲自相关的数值研究 下载: 784次
Numerical Study on Autocorrelation of Noise-Like Pulse in Fiber Lasers
非线性光学 类噪声脉冲 二阶自相关 光纤激光器 数值模拟 nonlinear optics noise-like pulse second order autocorrelation fiber lasers numerical simulation
摘要
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。
Abstract
The autocorrelation characteristics of the noise-like pulse generated from fiber laser are investigated using numerical analysis. Numerically calculated autocorrelation traces agree with experimental results. By changing the parameters, it is found that the pedestal and the spike reflect the average pulse width and intrapulse width, respectively. Increasing intra- pulse number in a noise- like pulse leads to a smaller spike- topedestal intensity ratio, while the width of the pedestal and the spike are not obviously influenced. Numerical analyses show that the contrast ratio of the interferometric autocorrelation trace less than 8∶1, which is detected in experiment, is determined by the noise-like pulse width ,pulse chirp and scan range.
金鑫鑫, 李雷, 罗娇林, 葛颜绮, 张倩, 赵鹭明. 光纤激光器中类噪声脉冲自相关的数值研究[J]. 激光与光电子学进展, 2015, 52(12): 121902. Jin Xinxin, Li Lei, Luo Jiaolin, Ge Yanqi, Zhang Qian, Zhao Luming. Numerical Study on Autocorrelation of Noise-Like Pulse in Fiber Lasers[J]. Laser & Optoelectronics Progress, 2015, 52(12): 121902.