Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Frequency down conversion through Bose condensation of light   We propose an experimental set up allowing to convert an input light of
wavelengths about $1-2 \mu m$ into an output light of a lower frequency. The
basic principle of operating relies on the nonlinear optical properties
exhibited by a microcavity filled with glass. The light inside this material
behaves like a 2D interacting Bose gas susceptible to thermalise and create a
quasi-condensate. Extension of this setup to a photonic bandgap material (fiber
grating) allows the light to behave like a 3D Bose gas leading, after
thermalisation, to the formation of a Bose condensate. Theoretical estimations
show that a conversion of $1 \mu m$ into $1.5 \mu m$ is achieved with an input
pulse of about $1 ns$ with a peak power of $10^3 W$, using a fiber grating
containing an integrated cavity of size about $500 \mu m \times 100 \mu m^2$.

5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
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The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio