Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultra-high Q whispering-gallery-mode bottle microresonators: properties
  and applications   Highly prolate-shaped whispering-gallery-mode "bottle microresonators" have
recently attracted considerable attention due to their advantageous properties.
We experimentally show that such resonators offer ultra-high quality factors,
microscopic mode volumes, and near lossless in- and out-coupling of light using
ultra-thin optical fibers. Additionally, bottle microresonators have a simple
and customizable mode structure. This enables full tunability using mechanical
strain and simultaneous coupling of two ultra-thin coupling fibers in an
add-drop configuration. We present two applications based on these
characteristics: In a cavity quantum electrodynamics experiment, we actively
stabilize the frequency of the bottle microresonator to an atomic transition
and operate it in an ultra-high vacuum environment in order to couple single
laser-cooled atoms to the resonator mode. In a second experiment, we show that
the bottle microresonator can be used as a low-loss, narrow-band add-drop
filter. Using the Kerr effect of the silica resonator material, we furthermore
demonstrate that this device can be used for single-wavelength all-optical
signal processing.

23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio