Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Integration of an optical fiber taper with an optical microresonator
  fabricated in glass by femtosecond laser 3D micromachining   We report on fabrication of a microtoroid resonator of a high-quality factor
(i. e., Q-factor of ~3.24x10^6 measured under the critical coupling condition)
using femtosecond laser three-dimensional (3D) micromachining. Coupling of
light into and out of the microresonator has been realized with a fiber taper
that is reliably assembled with the microtoroid. The assembly of the fiber
taper to the microtoroid is achieved by welding the fiber taper onto the
sidewall of the microtoroid using CO2 laser irradiation. The integrated
microresonator maintains a high Q-factor of 3.21x10^5 as measured in air.

9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int