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Similar

D. Sigg and N. Mavalvala, J. Opt. Soc. Am. A 17
2000
Cited alongside, same era.
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2008
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T. J. Kippenberg and K. J. Vahala, Science 321
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Cited alongside, same era.

Then

The LIGO Scientific Collaboration, Rep. Prog. Phys. 72
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Later among the works it cites.
H. Grote and The LIGO Scientific Collaboration, CQG 27
2010
Later among the works it cites.
T. Fricke, N. Smith-Lefebvre, R. Abbott, R. Adhikari, K. Dooley, M. Evans, P. Fritschel, V. Frolov, K. Kawabe, and S. Waldman, “DC Readout Experiment in Enhanced LIGO”, Preprint (2011)
2011
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2011

Optimal Alignment Sensing of a Readout Mode Cleaner Cavity

Smith-Lefebvre, Nicolas, Ballmer, Stefan, Evans, Matt et al.

Understand

Critically coupled resonant optical cavities are often used as mode cleaners in optical systems to improve the signal to noise ratio (SNR) of a signal that is encoded as an amplitude modulation of a laser beam.

Achieving the best SNR requires maintaining the alignment of the mode cleaner relative to the laser beam on which the signal is encoded.
An automatic alignment system which is primarily sensitive to the carrier field component of the beam will not, in general, provide optimal SNR.
We present an approach that modifies traditional dither alignment sensing by applying a large amplitude modulation on the signal field, thereby producing error signals that are sensitive to the signal sideband field alignment.