Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Efficient generation of highly squeezed light and second harmonic wave
  with periodically poled MgO:LiNbO_3   We report on effective generation of continuous-wave squeezed light and
second harmonics with a periodically poled MgO:LiNbO$_{\mathrm{3}}$ (PPMgLN)
crystal which enables us to utilize the large nonlinear optical coefficient
$d_{\mathrm{33}}$. We achieved the squeezing level of $-7.60 \pm 0.15$dB at 860
nm by utilizing a subthreshol optical parametric oscillator with a PPMgLN
crystal. We also generated 400 mW of second harmonics at 430 nm from 570 mW of
fundamental waves with 70% of conversion efficiency by using a PPMgLN crystal
inside an external cavity.

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The categories of this paper are: cs
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con