Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precise Determination of Minimum Achievable Temperature for Solid-State
  Optical Refrigeration   We measure the minimum achievable temperature (MAT) as a function of
excitation wavelength in anti-Stokes fluorescence cooling of high purity
Yb3+-doped LiYF4 (Yb:YLF) crystal. Such measurements were obtained by
developing a sensitive noncontact thermometry that is based on a two-band
differential luminescence spectroscopy using balanced photo-detectors. These
measurements are in excellent agreement with the prediction of the laser
cooling model and identify MAT of 110 K at 1020 nm, corresponding to E4-E5
Stark manifold transition in Yb:YLF crystal.

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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph