Gomes Tiago, Canhota Miguel, Crespo Helder
Opt Lett. 2022 Aug 1;47(15):3660-3663. doi: 10.1364/OL.460069.
We present a new, to the best of our knowledge, variant of dispersion scan (d-scan) based on surface third-harmonic generation (STHG) and a ptychographic algorithm tailored for full retrieval (amplitude and phase) of broadband laser pulses. We demonstrate the technique by temporally measuring and compressing few-cycle pulses with 7 fs and 2.5 nJ from a Ti:sapphire oscillator, using a sapphire window as the nonlinear medium. The results are in very good agreement with standard second-harmonic d-scan measurements based on a nonlinear crystal. The intrinsically broadband and phase-matching-independent nature of STHG make this technique very suitable for the characterization of ultrashort laser pulses over a broad wavelength range extending into the mid-infrared.
据我们所知，我们提出了一种基于表面三次谐波产生（STHG）的新型色散扫描（d扫描）变体，以及一种为宽带激光脉冲的全检索（幅度和相位）量身定制的叠层成像算法。我们使用蓝宝石窗口作为非线性介质，通过时间测量和压缩来自钛宝石振荡器的7 fs、2.5 nJ的少周期脉冲来演示该技术。结果与基于非线性晶体的标准二次谐波d扫描测量结果非常吻合。STHG固有的宽带和与相位匹配无关的特性使得该技术非常适合在延伸至中红外的宽波长范围内表征超短激光脉冲。
