Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Integration of spectral coronagraphy within VIPA-based spectrometers for
  high extinction Brillouin imaging   VIPA-based spectrometers have enabled rapid Brillouin spectrum measurements
and current designs of multi-stage VIPA spectrometers offer enough spectral
extinction to probe transparent tissue, cells and biomaterials. However, in
highly scattering media or in the presence of strong back-reflections, such as
at interfaces between materials of different refractive indices, VIPA-based
Brillouin spectral measurements are limited. While several approaches to
address this issue have recently been pursued, important challenges remain.
Here we have adapted the design of coronagraphs used for exosolar planet
imaging to the spectral domain and integrated it in a double-stage VIPA
spectrometer. We demonstrate that this yields an increase in extinction up to
20dB, with nearly no added insertion loss. The power of this improvement is
vividly demonstrated by Brillouin imaging close to reflecting interfaces
without need of index matching or sample tilting

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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: econ
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th