Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-performance coherent population trapping atomic clock with
  direct-modulation distributed Bragg reflector laser   The coherent population trapping (CPT) atomic clock is very promising for use
in next-generation spaceborne applications owing to its compactness and high
performance. In this paper, we propose and implement a CPT atomic clock based
on the direct modulation of a large-modulation-bandwidth and narrow-linewidth
distributed Bragg reflector laser, which replaces the usually used external
bulk modulator in the high-performance CPT clock. Our method retains the high
performance while significantly reducing the size. Using this highly compact
bichromatic light source and simplest CPT configuration, in which a circularly
polarized bichromatic laser interrogates the ^{87}Rb atom system, a CPT signal
of clock transition with a narrow linewidth and high contrast is observed. We
then lock the local oscillator frequency to the CPT error signal and
demonstrate a short-term frequency stability of 3.6 \times 10^{-13}
{\tau}^{-1/2} (4 s \le {\tau} \le 200 s). We attribute it to the ultralow laser
frequency and intensity noise as well as to the high-quality-factor CPT signal.
This study can pave the way for the development of compact high-performance CPT
clocks based on our scheme.

25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org