Loriot Vincent, Gitzinger Gregory, Forget Nicolas
Opt Express. 2013 Oct 21;21(21):24879-93. doi: 10.1364/OE.21.024879.
We investigate a variant of the d-scan technique, an intuitive pulse characterization method for retrieving the spectral phase of ultrashort laser pulses. In this variant a ramp of quadratic spectral phases is applied to the input pulses and the second harmonic spectra of the resulting pulses are measured for each chirp value. We demonstrate that a given field envelope produces a unique and unequivocal chirp-scan map and that, under some asymptotic assumptions, both the spectral amplitude and phase of the measured pulse can be retrieved analytically from only two measurements. An iterative algorithm can exploit the redundancy of the information contained in the chirp-scan map to discard experimental noise, artifacts, calibration errors and improve the reconstruction of both the spectral intensity and phase. This technique is compared to two reference characterization techniques (FROG and SRSI). Finally, we perform d-scan measurements with a simple grating-pair compressor.
我们研究了d扫描技术的一种变体，这是一种用于获取超短激光脉冲光谱相位的直观脉冲表征方法。在这种变体中，将二次光谱相位斜坡应用于输入脉冲，并针对每个啁啾值测量所得脉冲的二次谐波光谱。我们证明，给定的场包络会产生独特且明确的啁啾扫描图，并且在一些渐近假设下，仅通过两次测量就可以解析地检索出被测脉冲的光谱幅度和相位。迭代算法可以利用啁啾扫描图中包含的信息冗余来消除实验噪声、伪像、校准误差，并改善光谱强度和相位的重建。将该技术与两种参考表征技术（FROG和SRSI）进行了比较。最后，我们使用简单的光栅对压缩器进行了d扫描测量。
