论文标题
使用时空波数据包取消和反相正常和异常的组速度分散
Canceling and inverting normal and anomalous group-velocity dispersion using space-time wave packets
论文作者
论文摘要
角度分散可以平衡正常的组速度色散（GVD），从而增加了分散介质中的波形长度。通过倾斜波矢量，角度分散在这种情况下降低了轴向波数以匹配前GVD值。然而，与之相同的是，角度分散无法抵消异常GVD，相反，它降低了波形的长度。因此，迄今为止在异常分散体中尚未证明通过角度分散的GVD策略。我们在这里合成结构化的飞秒脉冲光束，称为“时空”波包包，旨在通过融合到脉冲场中的非差异性角度分散，旨在在正常或异常GVD方案中对称地分散局限性。此外，我们还验证了GVD内的：逆转该领域所经历的GVD符号，相对于介质本身的色散所决定的。
Angular dispersion can counterbalance normal group-velocity dispersion (GVD) that increases the wave-vector length in a dispersive medium. By tilting the wave vector, angular dispersion reduces the axial wave number in this case to match the pre-GVD value. By the same token, however, angular dispersion fails to counterbalance anomalous GVD, which in contrast reduces the wave-vector length. Consequently, GVD-cancellation via angular dispersion has not been demonstrated to date in the anomalous dispersion regime. We synthesize here structured femtosecond pulsed beams known as `space-time' wave packets designed to realize dispersion-cancellation symmetrically in either the normal- or anomalous-GVD regimes by virtue of non-differentiable angular dispersion inculcated into the pulsed field. Furthermore, we also verify GVD-inversion: reversing the GVD sign experienced by the field with respect to that dictated by the chromatic dispersion of the medium itself.
