用干涉自相关导数谱图明确超短脉冲啁啾方向

陈碧芳; 刘天夫; 杨琴

光学学报, 2009, 29 (6): 1557, 网络出版: 2009-06-08

用干涉自相关导数谱图明确超短脉冲啁啾方向

Determination of Chirp Direction in Ultrashort Laser Pulses Using Derivative Interference Autocorrelation

论文大纲

陈碧芳 ^1,*刘天夫 ²杨琴 ¹

作者单位

¹ 嘉兴学院机电工程学院, 浙江嘉兴 314001

² 中国计量学院信息工程学院, 浙江杭州 310034

摘要

提出了新型的确定超短激光脉冲啁啾方向的方法, 采用对二次干涉自相关(IAC)中的基频信号求一阶导数,得到干涉自相关导数谱图(D-IAC),利用该导数谱图对啁啾方向有很高灵敏度的特性,通过对高斯型强度分布的线性啁啾、平方啁啾及立方啁啾脉冲进行数值计算与模拟, 得到导数谱图的峰与谷分别对应啁啾的负与正。找到了判定啁啾正负的方向因子, 即正弦函数因子, 并通过实验证实用干涉自相关导数谱图可明确超短激光脉冲啁啾方向, 且干涉自相关导数谱图能用于超短激光脉冲啁啾方向的检测。

Abstract

A new method is presented for detection of chirp direction in ultrashort laser pulses. Based on interference autocorrelation (IAC) of the fundamental frequency signal for a first derivative, the derivative interference autocorrelation (D-IAC) is obtained. This method is highly sensitive to chirp direction. The linear chirp, square and cubic chirp pulses with Gaussian intensity are numerically calculated and simulated, and the derivative interference autocorrelation peak and the valley correspond negative and positive chirp separately. It is found the sine function factor can determine the direction of chirp. Experiments prove the chirp direction in ultrashort laser pulses can be determined by the derivative interference autocorrelation.

参考文献

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陈碧芳, 刘天夫, 杨琴. 用干涉自相关导数谱图明确超短脉冲啁啾方向[J]. 光学学报, 2009, 29(6): 1557. Chen Bifang, Liu Tianfu, Yang Qin. Determination of Chirp Direction in Ultrashort Laser Pulses Using Derivative Interference Autocorrelation[J]. Acta Optica Sinica, 2009, 29(6): 1557.

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