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啁啾脉冲频谱干涉仪(CPSI)是一种单发超快诊断仪器,其中采用大啁啾量的参考、探测脉冲并准确测量其频谱电场是仪器同时实现超高时间分辨和大量程测试的关键因素。基于变换极限飞秒脉冲和啁啾脉冲之间的频谱干涉,通过理论和数值计算研究提出了一种用于大啁啾量脉冲的频谱相位测量的线性光学测量方法,称之为非对称频谱干涉法。研究表明,当利用非对称频谱干涉法测量啁啾脉冲频谱干涉仪中的啁啾脉冲频谱相位时,时间延迟的平移误差和相对较小的飞秒脉冲啁啾会使测量结果产生一阶相位误差,并由此导致啁啾脉冲频谱干涉仪测量时域信号的结果产生时间上的平移,但是所测信号的相对时间演化过程不受其影响。
Chirped Pulse Spectral Interferometer (CPSI) is a single-shot ultra-fast diagnostic instrument where the use of a large chirp reference, the detection of pulses, and accurate measurement of its spectral electric field are the key to the instrument’s simultaneous ultra-high time resolution and large-range test factor. Based on the spectral interference between the transformed limit femtosecond pulse and the chirped pulse, a linear optical measurement method for spectral phase measurement of large chirp pulse is proposed by theoretical and numerical calculations, which is called asymmetric spectral interference law. The results show that when asymmetric spectral interferometry is used to measure the phase of the chirp pulse in the chirped pulse spectrum interferometer, the time delay translational error and the relatively small femtosecond pulse chirp can lead to the first-order phase error , And the resulting chirped pulse spectrum interferometer measures the time-domain signal resulting in a temporal shift, but the relative time evolution of the measured signal is unaffected.