Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kerr beam self-cleaning in the multimode fiber anomalous dispersion
  regime   We experimentally demonstrate Kerr beam self-cleaning in the anomalous
dispersion regime of graded-index multimode optical fibers. By using 90 ps
duration, highly chirped (2 nm bandwidth at -3dB) optical pulses at 1562 nm, we
demonstrate a 2 decades reduction, with respect to previous experiments in the
normal dispersion regime, of threshold peak power for beam self-cleaning into
the fundamental mode of the fiber, accompanied by more than 65% nonlinear
increase of intensity correlation into the fundamental mode. Highly efficient
self-selection of the LP11 mode is also observed. Self-cleaned beams remain
spatio-temporally stable for more than a decade of variation of the peak pulse
power.

34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom