论文标题
面纱的塔尔伯特效应
Veiled Talbot effect
论文作者
论文摘要
具有周期性横向空间谱的自由传播光场会经历周期性的轴向复兴，这是一种称为Talbot效应或自我形象的现象。我们在这里表明，将紧密的时空光谱相关性引入超快的脉冲光场，并具有周期性的横向空间轮廓消除了物理空间中的所有轴向动力学，同时揭示了新型的时空塔尔伯特效应，仅在进行时间分辨测量时才才能观察到。实际上，观察到“时间划分”，因此，固定轴向平面处的场包络的时间轮廓对应于单色场共享初始空间轮廓的空间传播曲线的一段，并在同一轴向平面上观察到。时间平均，这是观察强度的固有的，它完全面纱了这种效果。
A freely propagating optical field having a periodic transverse spatial profile undergoes periodic axial revivals - a well-known phenomenon known as the Talbot effect or self-imaging. We show here that introducing tight spatio-temporal spectral correlations into an ultrafast pulsed optical field with a periodic transverse spatial profile eliminates all axial dynamics in physical space while revealing a novel space-time Talbot effect that can be observed only when carrying out time-resolved measurements. Indeed, 'time-diffraction' is observed whereupon the temporal profile of the field envelope at a fixed axial plane corresponds to a segment of the spatial propagation profile of a monochromatic field sharing the initial spatial profile and observed at the same axial plane. Time-averaging, which is intrinsic to observing the intensity, altogether veils this effect.
