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紫外单次TG-FROG测量的基本原理是:将待测激光分成等光程的3束光,其中,两束光在非线性介质中形成瞬态光栅,对第3束激光进行衍射,其1级衍射光即自相关信号,包含脉冲时间信息,然后利用光谱仪将自相关信号在与时间轴垂直的方向上进行光谱展开,利用CCD获取时间-频率域内的二维谱图,最后利用FROG还原程序得到脉冲时域内波形、相位、脉宽和频域内光谱、相位、带宽等信息。本实验主要获取自相关信号。实验光路图如图1所示,将LLG50激光放大器出射的波长为248.4nm的紫外超短脉冲激光通
The basic principle of the UV single TG-FROG measurement is that the laser to be measured is divided into three light beams of equal optical path length, wherein two beams of light form a transient grating in a nonlinear medium and the third laser beam is diffracted, Order diffracted light that is self-correlated signal, including the pulse time information, and then use the spectrometer to autocorrelation signal in the direction of the vertical axis perpendicular to the spectral expansion, the use of CCD to obtain the two-dimensional spectrum of time-frequency domain, and finally use the FROG restore program Get pulse time domain waveform, phase, pulse width and frequency spectrum, phase, bandwidth and other information. This experiment mainly obtains the autocorrelation signal. Experimental optical circuit shown in Figure 1, the LLG50 laser amplifier wavelength of 248.4nm UV ultrashort pulse laser pass