Wu Jiaye, Hu Jianqi, Brès Camille-Sophie
Opt Lett. 2022 Feb 15;47(4):953-956. doi: 10.1364/OL.449715.
The temporal Talbot effect describes the periodic self-imaging of an optical pulse train along dispersive propagation. This is well studied in the context of bright pulse trains, where identical or multiplied pulse trains with uniform bright waveforms can be created. However, the temporal self-imaging has remained unexplored in the dark pulse regime. Here, we disclose such a phenomenon for optical dark pulse trains, and discuss the comparison with their bright pulse counterparts. It is found that the dark pulse train also revives itself at the Talbot length. For higher-order fractional self-imaging, a mixed pattern of bright and dark pulses is observed, as a result of the interference between the Talbot pulses and the background. Such unconventional behaviors are theoretically predicted and experimentally demonstrated by using programmable spectral shaping as well as by optical fiber propagation.
时间塔尔博特效应描述了光脉冲序列沿色散传播时的周期性自成像。这在亮脉冲序列的背景下已得到充分研究，在该背景下可以产生具有均匀亮波形的相同或倍增的脉冲序列。然而，时间自成像在暗脉冲领域仍未得到探索。在此，我们揭示了光暗脉冲序列的这种现象，并讨论了与亮脉冲对应物的比较。发现暗脉冲序列在塔尔博特长度处也会自我重现。对于高阶分数自成像，由于塔尔博特脉冲与背景之间的干涉，观察到亮脉冲和暗脉冲的混合模式。通过使用可编程光谱整形以及光纤传播，从理论上预测并通过实验证明了这种非常规行为。
