Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fiber-integrated spectroscopy device for hot alkali vapor   We introduce an all-glass, vacuum tight, fiber-integrated and alkali
compatible spectroscopy device consisting of two conventional optical fibers
spliced to each end of a capillary. This is mainly realized through a
decentered splicing method allowing refilling of the capillary and controlling
the vapor density inside. We analyze the light guidance of the setup through
simulations and measurements of the transmission efficiency at different
wavelengths and show that filling it with highly reactive alkali metals is
possible, and that the vapor density can be controlled reliably.

23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex