Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sending femtosecond pulses in circles: highly non-paraxial accelerating
  beams   We use caustic beam shaping on 100 fs pulses to experimentally generate
non-paraxial accelerating beams along a 60 degree circular arc, moving
laterally by 14 \mum over a 28 \mum propagation length. This is the highest
degree of transverse acceleration reported to our knowledge. Using diffraction
integral theory and numerical beam propagation simulations, we show that
circular acceleration trajectories represent a unique class of non-paraxial
diffraction-free beam profile which also preserves the femtosecond temporal
structure in the vicinity of the caustic.

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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: cond-mat