Alonso Benjamín, Holgado Warein, Sola Íñigo J
Opt Express. 2020 May 11;28(10):15625-15640. doi: 10.1364/OE.386321.
A method of ultrashort laser pulse reconstruction is presented, consisting on the analysis of the nonlinear signal obtained from the interference of the pulse with a replica of itself at a given time delay while varying the relative amplitude between the pulses. The resulting spectral traces are analyzed both analytically and numerically, showing the encoding of the input pulse spectral phase. A reconstruction algorithm is discussed and applied to extract the spectral phase and, jointly to the measured spectral amplitude, reconstructing the pulse. In order to validate the technique, an experimental in-line implementation of the characterization concept is compared to the results from a stablished technique, obtaining a good agreement at different input pulse cases. In sum, a new technique is presented, showing the capability to reconstruct a broad range of temporal pulse durations while its implementation is robust and straightforward, able to be easily adapted to diverse pulse duration and central wavelength ranges.
本文提出了一种超短激光脉冲重建方法，该方法基于对非线性信号的分析，该非线性信号是通过脉冲与其自身的一个副本在给定时间延迟下干涉得到的，同时改变脉冲之间的相对幅度。对所得的光谱轨迹进行了解析和数值分析，显示了输入脉冲光谱相位的编码。讨论并应用了一种重建算法来提取光谱相位，并结合测量的光谱幅度来重建脉冲。为了验证该技术，将表征概念的实验在线实现与一种成熟技术的结果进行了比较，在不同输入脉冲情况下获得了良好的一致性。总之，提出了一种新技术，该技术显示出能够重建广泛的时间脉冲持续时间，同时其实现稳健且直接，能够轻松适应不同的脉冲持续时间和中心波长范围。
