飞秒脉冲干涉自相关修正光谱的啁啾特性  

Chirp characteristics of modified spectrum autointerferometric correlation for femtosecond pulse

作　　者：陈碧芳[1] 刘天夫[2] 

机构地区：[1]嘉兴学院机电工程学院,嘉兴314001 [2]中国计量学院信息工程学院,杭州310034

出　　处：《激光技术》2007年第6期587-589,592,共4页Laser Technology

摘　　要：为了测量飞秒激光脉冲啁啾,采用了一种对干涉自相关光谱作频谱修正的简单方法,得到干涉自相关修正光谱。利用该修正光谱对啁啾有很高灵敏度的特性,对高斯型强度分布的线性啁啾、平方啁啾脉冲进行了理论分析和实验验证,取得了修正光谱的下包络峰的高度与啁啾量对应关系、下包络峰的个数与啁啾次数对应关系。结果表明,根据干涉自相关修正光谱下包络的峰值,可估定啁啾的量值,根据干涉自相关修正光谱下包络峰的个数可以判断脉冲啁啾的次数。这一结果对精确地测量飞秒激光脉冲的微小啁啾量是有帮助的。A simple method which can measure the chirp of femto-second laser pulses was described. Modified spectrum autointerferometric correlation （ MOSAIC ） uses spectral filtering of the interferometric autocorrelation （ IAC ） to render a waveform that is highly sensitive to chirp. The Gaussian intensity of femto-second chirped pulses was numerically calculated. The peak of the MOSAIC minima envelope as a function of the normalized mean chirp for different orders of chirp and MOSAIC peak number corresponding to the first- and second-order chirps were obtained. Low chirp of femto-second laser pulses can be determined accurately with the MOSAIC.

关 键 词：超快光学 飞秒脉冲测量 干涉自相关修正光谱 啁啾 包络 

分 类 号：TN247[电子电信—物理电子学]