测量超短激光脉冲啁啾阶数及量值的一种新方法

A novel method for measuring the order and magnitude of chirp in ultrashort laser pulses

提出了一种测量超短激光脉冲啁啾阶数及量值的新方法。根据二次干涉自相关(IAC)包络比值对啁啾有很高灵敏度的特性,通过对IAC包络比值进行分析计算获得判断啁啾阶数的方法,并得到包络比值中央半宽与啁啾量值间的对应关系。采用IAC二次谐波检测系统对加浓染料激光器输出的脉冲进行测量,结果表明,被测超短激光脉冲含有平方啁啾,啁啾参数为0.80,实现了对超短激光脉冲啁啾阶数及量值测量。

A novel method is presented to determine the order and magnitude of chirps in ultrashort laser pulses based on the ratio of interferometric auto-correlation（IAC） envelope, which is highly sensitive to the chirps.By analyzing and calculating the ratio, the order of chirps and the center halfwidth of IAC envelope ratio as a function of the chirp magnitude for different order chirps are obtained.As an example, the chirp of a short pulse dye laser is determined with the method.In this laser, a square chirp pulse is found, and the chirped parameter is 0.80.So, a higher order chirp measurement is realized.