Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficient soliton self-frequency shift in hydrogen-filled hollow-core
  fiber   We report a study of soliton self-frequency shifting in hydrogen-filled
hollow-core fiber. The combination of hydrogen and short 40-fs input pulses
underlies clean and efficient generation of Raman solitons between 1080 and
1600 nm. With 240-nJ input pulses, the Raman soliton energy ranges from 110 to
20 nJ over that wavelength range, and the pulse duration is approximately 45
fs. In particular, 70-nJ and 42-fs pulses are generated at 1300 nm. Numerical
simulations agree reasonably well with experiments and predict that
microjoule-energy tunable pulses should be possible with higher-energy input
pulses.

5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
1
The categories of this paper are: cs