We introduce a practical self-referenced device for the complete temporal intensity-and-phase measurement of few-femtojoule-level fs and ps pulses based on the simple version of frequency-resolved-optical gating, called GRENOUILLE. We replace the usual crossed-beam line-focus geometry with a point-focus near-collinear-beam geometry and a traditional delay line that allows a longer path length in the nonlinear medium, yielding greater sensitivity. As an initial demonstration of the device, we measured moderately complex pulses at energies as weak as 24 fJ with high signal-to-noise ratio. We confirmed the results measured using our technique to that of a standard GRENOUILLE and a high-resolution spectrometer.

中文翻译：

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高灵敏度、简单的频率分辨光选通装置

我们介绍了一种实用的自参考设备，用于基于简单版本的频率分辨光学门控（称为 GRENOUILLE）对几飞焦级 fs 和 ps 脉冲进行完整的时间强度和相位测量。我们用点聚焦近共线光束几何结构和传统延迟线取代了通常的交叉光束线聚焦几何结构，允许在非线性介质中具有更长的路径长度，从而产生更高的灵敏度。作为该设备的初步演示，我们以高信噪比测量了能量低至 24 fJ 的中等复杂脉冲。我们确认了使用我们的技术测量的结果与标准 GRENOUILLE 和高分辨率光谱仪的结果。