飞秒脉冲干涉自相关修正光谱的啁啾特性

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.

Chirp characterization of modified spectrum autointerferometric correlation for femtosecond pulse

A simple method which can measure the chirp of femtosecond 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.