| 飞秒激光啁啾的直观可行检测方法 |
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| 引用本文： | 刘天夫,胡桂林,陈碧芳,余时帆. 飞秒激光啁啾的直观可行检测方法[J]. 红外与激光工程, 2012, 41(1): 73-78 |
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| 作者姓名： | 刘天夫 胡桂林 陈碧芳 余时帆 |
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| 作者单位： | 1.中国计量学院 信息工程系,浙江 杭州 310018; |
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| 基金项目： | 国家自然科学基金(50806068) |
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| 摘 要： | 基于飞秒脉冲相关干涉项含有脉冲的相位和频率信息，测量自相关二次谐波干涉条纹可见的振荡频率为?棕?子及2?棕?子两个谱分量的大小和形状，以及二次干涉自相关函数包络面积的大小和形状，可以得到飞秒激光脉冲啁啾大小的信息。另外，通过对二次干涉自相关(IAC)迹线求一阶导数得到的干涉自相关导数光谱(D?鄄MOSAIC)的峰谷与啁啾正负对应关系，找到了判定啁啾正负的方向因子即正弦函数因子，据此能够判断飞秒激光脉冲啁啾的正负。因此，采用能够满足光学相干探测基本条件的测量系统，利用二阶干涉自相关法可以用来检测飞秒脉冲激光的啁啾特性。
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| 关 键 词： | 飞秒激光脉冲 啁啾大小与方向 干涉自相关 干涉自相关导数光谱 |
Feasible and intuitive measuring method for femtosecond laser pulses chirp |
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| Liu Tianfu,Hu Guilin,Chen Bifang,Yu Shifan. Feasible and intuitive measuring method for femtosecond laser pulses chirp[J]. Infrared and Laser Engineering, 2012, 41(1): 73-78 |
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| Authors: | Liu Tianfu Hu Guilin Chen Bifang Yu Shifan |
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| Affiliation: | 1.Department of Information Engineering,China Jiliang University,Hangzhou 310018,China;2.School of Light Industry,Zhejiang University of Science and Technology,Hangzhou 310023,China;3.School of Mechanical & Electrical Engineering,Jiaxing University,Jiaxing 314001,China;4.Zhejiang Province Institute of Metrology,Hangzhou 310013,China) |
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| Abstract: | Based on the fact that interferometric correlation term of femtosecond pulse contains the phase and frequency information,the magnitude information of chirp of femtosecond laser pulse can be obtained by measuring the magnitude and shape of two visual spectra component with surging frequency ωτ and 2ωτ inside the autocorrelation second harmony interferometric stripe,and the area and shape of envelope of second interferometric autocorrelation function.Otherwise,through the derivative modified spectrum of autointerferometric correlation(D-MOSAIC) derived from a conventional second order interferometric autocorrelation trace,whose peak and value correspond to the positive and negative chirp,the sine function factor of the determinant chirp direction was obtained.Futhermore,chirp direction of ultrashort laser pulses could be determined.Thus,the chirp characteristics of femtosecond pulse laser could be detected through second order autointerferometric correlation using measurement system meeting basic condition of optics interference. |
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| Keywords: | femtosecond laser pulse magnitude and direction of chirp interferometric autocorrelation (IAC) derivative modified spectrum autointerferometric correlation(D-MOSAIC) |
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