Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Canceling and inverting normal and anomalous group-velocity dispersion
  using space-time wave packets   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.

16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph