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。
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.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第12期173-179,共7页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61275109)
江苏省高校优势学科建设工程
江苏省自然科学基金(BK20140231)
江苏省普通高校研究生科研创新计划项目(KYLX_1427)
关键词
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
