Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Audio-band Coating Thermal Noise Measurement for Advanced LIGO with a
  Multi-mode Optical Resonator   In modern high precision optical instruments, such as in gravitational wave
detectors or frequency references, thermally induced fluctuations in the
reflective coatings can be a limiting noise source. This noise, known as
coating thermal noise, can be reduced by choosing materials with low mechanical
loss. Examination of new materials becomes a necessity in order to further
minimize the coating thermal noise and thus improve sensitivity of next
generation instruments. We present a novel approach to directly measure coating
thermal noise using a high finesse folded cavity in which multiple
Hermite-Gaussian modes co-resonate. This method is used to probe surface
fluctuations on the order 10^-17 m\rtHz in the frequency range 30-400 Hz. We
applied this technique to measure thermal noise and loss angle of the coating
used in Advanced LIGO.

25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat