Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A compact and stable incidence-plane-rotating second harmonics detector   We describe a compact and stable setup for detecting the optical second
harmonics, in which the incident plane rotates with respect to the sample. The
setup is composed of rotating Fresnel-rhomb optics and a femtosecond
ytterbium-doped fiber-laser source operating at the repetition frequency of 10
MHz. The setup including the laser source occupies an area of 1 m2 and is
stable so that the intensity fluctuation of the laser harmonics can be less
than 0.2 % for 4 h. We present the isotropic harmonic signal of a gold mirror
of 0.5 pW and demonstrate the integrity and sensitivity of the setup. We also
show the polarization-dependent six-fold pattern of the harmonics of a
few-layer WSe2, from which we infer the degree of local-field effects. Finally,
we describe the extendibility of the setup to investigate the samples in
various conditions such as cryogenic, strained, ultrafast non-equilibrium, and
high magnetic fields.

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The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph