实时飞秒激光单次测量研究

Study on real-time single-shot measurement of femtosecond laser

为了能够对强场飞秒激光进行单发实时准确的测量,采用LabVIEW对单次自相关仪测量的数据进行实时分析处理,设计了实时在线测量飞秒激光脉冲的测量系统。在数据分析时,通过对图像处理区域的限制以及对图像数据积分极大地降低了信号的噪声,提高了测量的准确性。利用自标定方法在线标定自相关仪,实时获得激光脉冲宽度信息;结合小尺寸像素CCD,获得单像素3.6fs的精度;并利用自主搭建的设备,成功在线实时测量了中心波长800nm、脉宽约50fs的钛宝石激光脉冲。结果表明,基于LabVIEW的单次相关仪能够实时测量飞秒脉冲,且测量结果精度高、可靠性好。

In order to measure high intensity femtosecond laser with single-shot precisely in real-time, a real-time measurement system was designed via processing data from a single-shot autocorrelator with LabVIEW. The precision is highly improved with signal noise decreased by limiting image processing area and integrating the image data. The autocorrelator was calibrated on-line by means of self-calibration,and pulse duration was obtained in real time. The precision of 3. 6fs per pixel was obtained with small-pixel-size CCD. Ti∶ sapphire laser with pulsewidth of 50 fs and center wavelength of 800 nm was measured in real-time with our developed device. The results prove that femtosecond pulses can be measured precisely in real-time with a single-shot autocorrelator based on LabVIEW.