Dispersion Scan Frequency Resolved Optical Gating For Evaluation of Pulse Chirp Instability

M. Guesmi, P. Veselá, K. Žídek
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Abstract

The commonly used methods to characterize ultrafast laser pulses, such as frequency-resolved optical gating (FROG) and dispersion scan (d-scan), face problems when they are used on pulses varying within the acquisition time or laser beam. Such chirp variation can be identified by a discrepancy between the measured FROG and d-scan traces and their reconstructed counterparts. Nevertheless, quantification of the instability from the experimental data is a more complex task. In this work, we evaluate the precision of chirp instability quantification based on three different pulse characterization techniques. Two commonly used techniques FROG and d-scan are compared to a new method dispersion scan FROG (D-FROG) that combines the idea of dispersion scanning with the FROG method. We demonstrate the characterization of pulses generated from NOPA together with pulses processed by a 4f-pulse shaper without and with SLM-adjusted phase. In this paper, we validate the performance of the new method to estimate the chirp instability and, therefore, to improve the reconstruction of the measured results. Furthermore, we discuss the instability origin of each measurement case by using fast-scan autocorrelation traces.
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色散扫描分频光门控对脉冲啁啾不稳定性的评价
频率分辨光门控(FROG)和色散扫描(d-scan)等常用的表征超快激光脉冲的方法,当它们用于在采集时间或激光束内变化的脉冲时,会面临问题。这种啁啾变化可以通过测量的FROG和d扫描迹线与重建的对应迹线之间的差异来识别。然而,从实验数据中量化不稳定性是一项更为复杂的任务。在这项工作中,我们评估了基于三种不同的脉冲表征技术的啁啾不稳定性量化的精度。将两种常用的技术FROG和d-scan与一种新的方法色散扫描FROG (D-FROG)进行比较,该方法将色散扫描的思想与FROG方法相结合。我们演示了由NOPA产生的脉冲的特性,以及由无slm调整相位和有slm调整相位的4f脉冲整形器处理的脉冲。在本文中,我们验证了新方法在估计啁啾不稳定性方面的性能,从而改进了测量结果的重建。此外,我们还利用快速扫描自相关迹线讨论了每种测量情况的不稳定来源。
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