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arXiv 1707.07567physics.opticsphysics.ins-det
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利用外差时间透镜和超快数字时间全息进行单次相位和振幅测量

Phase and Amplitude single-shot measurement by using heterodyne time-lens and ultrafast digital time-holography

Alexey Tikan, Serge Bielawski, Christophe Szwaj, Stephane Randoux, Pierre Suret

摘要:

时间成像系统是单次观测具有不规则和超快动态的光学信号的杰出工具。它们允许以飞秒分辨率记录长时间窗口,并且不依赖于复杂的算法。然而,同时记录振幅和相位仍然是这些系统的一个公开的挑战。在这里,我们提出了一种新的外差时间透镜安排,有效地记录复杂信号的幅度和相位,同时保持经典的时间透镜系统的性能($\sim 200$ ~fs)和视场(几十ps)。相位和时间被编码到相机的两个空间维度上。我们演示了我们的外差时间透镜的直接应用到被动式光场和光学流氓波产生的非线性传播的部分相干波内光纤。我们还展示了这种相位敏感的时间透镜系统如何使数字时间全息术能够以更高的时间分辨率(80 fs)进行。

英文摘要:

Temporal imaging systems are outstanding tools for single-shot observation of optical signals that have irregular and ultrafast dynamics. They allow long time windows to be recorded with femtosecond resolution, and do not rely on complex algorithms. However, simultaneous recording of amplitude and phase remains an open challenge for these systems. Here we present a new heterodyne time-lens arrangement that efficiently records both the amplitude and phase of complex signals, while keeping the performances of classical time-lens systems ($\sim 200$~fs) and field of view (tens of ps). Phase and time are encoded onto the two spatial dimensions of a camera. We demonstrate direct application of our heterodyne time lens to turbulent-like optical fields and optical rogue waves generated from nonlinear propagation of partially coherent waves inside optical fibres. We also show how this phase-sensitive time-lens system enables digital temporal holography to be performed with even higher temporal resolution (80 fs).

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