An optical lock-in camera for advanced gravitational wave interferometers. (arXiv:1907.05224v1 [astro-ph.IM])
<a href="http://arxiv.org/find/astro-ph/1/au:+Cao_H/0/1/0/all/0/1">Huy Tuong Cao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brown_D/0/1/0/all/0/1">Daniel D. Brown</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Veitch_P/0/1/0/all/0/1">Peter Veitch</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ottaway_D/0/1/0/all/0/1">David J. Ottaway</a>

Knowledge of the intensity and phase profiles of spectral components in a
coherent optical field is critical for a wide range of high-precision optical
applications. One of these is interferometric gravitational wave detectors,
which rely on such fields for precise control of the experiment. Here we
demonstrate a new device, an textit{optical lock-in camera}, and highlight how
they can be used within a gravitational wave interferometer to directly image
fields at a higher spatial and temporal resolution than previously possible.
This improvement is achieved using a Pockels cell as a fast optical switch
which transforms each pixel on a sCMOS array into an optical lock-in amplifier.
We demonstrate that the optical lock-in camera can image fields with 2~Mpx
resolution at 10~Hz with a sensitivity of -62~dBc when averaged over 2s.

Knowledge of the intensity and phase profiles of spectral components in a
coherent optical field is critical for a wide range of high-precision optical
applications. One of these is interferometric gravitational wave detectors,
which rely on such fields for precise control of the experiment. Here we
demonstrate a new device, an textit{optical lock-in camera}, and highlight how
they can be used within a gravitational wave interferometer to directly image
fields at a higher spatial and temporal resolution than previously possible.
This improvement is achieved using a Pockels cell as a fast optical switch
which transforms each pixel on a sCMOS array into an optical lock-in amplifier.
We demonstrate that the optical lock-in camera can image fields with 2~Mpx
resolution at 10~Hz with a sensitivity of -62~dBc when averaged over 2s.

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