Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High flux coherent supercontinuum soft X-ray source driven by a
  single-stage 10 mJ, kHz, Ti:sapphire laser amplifier   We demonstrate the highest flux tabletop source of coherent soft X-rays to
date, driven by a single-stage 10 mJ Ti:sapphire regenerative amplifier at 1
kHz. We first down-convert the laser to 1.3 um using a parametric amplifier,
before up-converting it to soft X-rays using high harmonic generation in a
high-pressure, phase matched, hollow waveguide geometry. The resulting
optimally phase matched broadband spectrum extends to 200 eV, with a soft X-ray
photon flux of > 10^6 photons/pulse/1% bandwidth at 1 kHz, corresponding to >
10^9 photons/s/1% bandwidth, or approximately a three order-of-magnitude
increase compared with past work. Finally, using this broad bandwidth X-ray
source, we demonstrate X-ray absorption spectroscopy of multiple elements and
transitions in molecules in a single spectrum, with a spectral resolution of
0.25 eV, and with the ability to resolve the near edge fine structure.

31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
16
The categories of this paper are: stat
18
The categories of this paper are: econ