超短脉冲混合啁啾权重的干涉自相关宽度测量

Measurement of the Hybrid Chirp Weigh in Ultrashort Laser Pulses by UsingInterferometric Autocorrelation Width

利用二次干涉自相关(IAC)宽度对啁啾有很高灵敏度以及含有不同混合啁啾权重的超短激光脉冲有不同宽度的特性.提出了一种测量超短激光脉冲混合啁啾权重及啁啾量值的简单方法,通过对高斯型含有线性和平方啁啾的干涉自相关函数进行理论分析与数值计算,得到干涉自相关宽度与混合啁啾权重及啁啾量值之间的对应关系.采用干涉自相关二次谐波检测系统对加浓染料激光器输出的含有啁啾的脉冲进行测量,结果显示:被测超短激光脉冲线性啁啾参数为0.17±0.10且平方啁啾参数为0.73±0.01.由此得出,干涉自相关宽度能容易地测量超短激光脉冲的啁啾量值.

A simple method is presented for measuring the weigh of hybrid chirp in ultrashort laser pulses, based on the high chirp--sensitive interferometric autocorrelation （IAC） width, and the characteristic of the dependence of width of interferometric autocorrelation （IAC） on different magnitude of the chirp weigh. Theoretical analyses and numerical calculations were made through the Gaussian intensity with linear and square chirp pulses, and the interferometric autocorrelation （IAC） width as a function of the linear chirp for different weigh was obtained. With this method, the hybrid chirp in ultrashort laser pulses was found and the linear chirp, as well as the square chirp, in chirped ultrashort laser pulse was measured at 0.17±0.10 and 0.73±0.01, respectively. Chirp of ultrashort laser pulses can be determined easily by using the interferometric autocorrelation （IAC） width.