Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High Frame-Rate Phase Camera for High-Resolution Wavefront Sensing in
  Gravitational-Wave Detectors   We present a novel way of wavefront sensing using a commercially available,
continuous-wave time-of-flight camera with QVGA-resolution. This CMOS phase
camera is capable of sensing externally modulated light sources with
frequencies up to 100 MHz. The high-spatial-resolution of the sensor, combined
with our integrated control electronics, allows the camera to image power
modulation index as low as -62 dBc/second/pixel. The phase camera is applicable
to problems where alignment and mode-mismatch sensing is needed and suited for
diagnostic and control applications in gravitational-wave detectors.
Specifically, we explore the use of the phase camera in sensing the beat
signals due to thermal distortions from point-like heat absorbers on the test
masses in the Advanced LIGO detectors. The camera is capable of sensing optical
path distortions greater than about two nanometers in the Advanced LIGO input
mirrors, limited by the phase resolution. In homodyne readout, the performance
can reach up to 0.1 nm, limited by the modulation amplitude sensitivity.

6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph