Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultranarrow linewidth photonic-atomic laser   Lasers with high spectral purity can enable a diverse application space,
including precision spectroscopy, coherent high-speed communications, physical
sensing, and manipulation of quantum systems. Already, meticulous design and
construction of bench Fabry-Perot cavities has made possible dramatic
achievements in active laser-linewidth reduction, predominantly for
optical-atomic clocks. Yet there is increasing demand for miniaturized laser
systems operating with high performance in ambient environments. Here, we
report a compact and robust photonic-atomic laser comprising a 2.5 cm long,
20,000 finesse, monolithic Fabry-Perot cavity integrated with a micromachined
rubidium vapor cell. By leveraging the short-time frequency stability of the
cavity and the long-time frequency stability of atoms, we realize an
ultranarrow-linewidth laser that enables integration for extended measurements.
Specifically, our laser supports a fractional-frequency stability of $1\times
10^{-13}$ at an averaging time of 20 ms, $7 \times 10^{-13}$ at 300 s, an
integrated linewidth of 25 Hz that results from thermal noise, a Lorentzian
linewidth as low as 0.06 Hz$^2$/Hz, and a passive vibration immunity as low as
$10^{-10}$/g. Our work explores hybrid laser systems with monolithic photonic
and atomic packages based on physical design.

34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat