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在飞秒激光的放大过程中,由于增益窄化,光谱漂移等效应,输出的光谱会发生很大的畸变。光谱的畸变会造成超短激光脉冲宽度的展宽和对比度的下降。为了能补偿光谱的畸变,采用Tournois研制可编程的声光色散滤波器(acousto-optic programmable dispersive filter,AOPDF)对输入脉冲进行了调制,它不仅能够提供较大的增益补偿能力,而且能提供大的色散补偿范围.其光谱与色散的补偿都是可以通过计算机软件的控制来实现的,可视化强,操作简单,且可以提供软件控制接口实现远程闭环控制。本工作采用光谱仪在线实时测量输出光谱数据,以此计算出调制曲线的形状,反馈给可编程声光色散滤波器进行的光谱补偿。
In the femtosecond laser amplification process, due to narrowing of the gain, spectral drift and other effects, the output spectrum will be a great distortion. Distortion of the spectrum can cause broadening of the ultrashort laser pulse width and decrease of contrast. In order to compensate for the spectral distortion, the input pulse is modulated using a programmable AOU (AOPDF) by Tournois, which not only provides a large gain compensation capability but also provides a large Of the dispersion compensation range.Its spectral and dispersion compensation can be achieved through the control of computer software, visualization, simple operation, and can provide software control interface for remote closed-loop control. In this work, spectrometer real-time measurement of output spectral data is used to calculate the shape of the modulation curve and feedback to the spectral compensation of the programmable acousto-optic dispersive filter.