用时空波包抵消和反演正常和异常群速度色散
Canceling and inverting normal and anomalous group-velocity dispersion using space-time wave packets
摘要：
角色散可以抵消正常的群速度色散（GVD），增加色散介质中的波矢长度。在这种情况下，通过倾斜波矢量，角色散减少了轴向波数，以匹配GVD前的值。然而，出于同样的原因，角色散不能抵消反常的GVD，这相反地减小了波矢长度。因此，GVD取消通过角色散尚未被证明迄今为止在异常色散制度。我们在这里合成的结构飞秒脉冲光束称为“时空”波包，旨在实现色散抵消对称的正常或非线性GVD制度凭借不可微的角色散灌输到脉冲场。此外，我们还验证了GVD反转：反转的GVD符号所经历的领域相对于所规定的介质本身的色散。
英文摘要：
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.
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