Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 1, 2012 | Published
Journal Article Open

Multicolor cavity metrology


Long-baseline laser interferometers used for gravitational-wave detection have proven to be very complicated to control. In order to have sufficient sensitivity to astrophysical gravitational waves, a set of multiple coupled optical cavities comprising the interferometer must be brought into resonance with the laser field. A set of multi-input, multi-output servos then lock these cavities into place via feedback control. This procedure, known as lock acquisition, has proven to be a vexing problem and has reduced greatly the reliability and duty factor of the past generation of laser interferometers. In this article, we describe a technique for bringing the interferometer from an uncontrolled state into resonance by using harmonically related external fields to provide a deterministic hierarchical control. This technique reduces the effect of the external seismic disturbances by 4 orders of magnitude and promises to greatly enhance the stability and reliability of the current generation of gravitational-wave detectors. The possibility for using multicolor techniques to overcome current quantum and thermal noise limits is also discussed.

Additional Information

© 2012 Optical Society of America. Received May 9, 2012; revised August 2, 2012; accepted August 17, 2012; posted August 17, 2012 (Doc. ID 167857); published September 12, 2012. We gratefully acknowledge illuminating discussions with Bram Slagmolen, Nicolas Smith-Lefebvre, and Peter Fritschel. We also thank the National Science Foundation for support under grant PHY-0555406.

Attached Files

Published - Izumi_264.pdf


Files (1.5 MB)
Name Size Download all
1.5 MB Preview Download

Additional details

August 19, 2023
August 19, 2023