Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Integrated frequency comb laser with narrow intrinsic optical linewidth
  based on a dielectric waveguide feedback circuit   We present an integrated hybrid semiconductor-dielectric (InP-Si$_3$N$_4$)
waveguide laser that generates frequency combs at a wavelength around 1.5
$\mu$m with a record-low intrinsic optical linewidth of 34 kHz. This is
achieved by extending the cavity photon lifetime using a low-loss dielectric
waveguide circuit. In our experimental demonstration, the on-chip, effective
optical path length of the laser cavity is extended to 6 cm. The resulting
linewidth narrowing shows the high potential of on-chip, highly coherent
frequency combs with direct electrical pumping, based on hybrid and
heterogeneous integrated circuits making use of low-loss dielectric waveguides.

19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn