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Published March 15, 2011 | metadata_only
Journal Article

Balancing interferometers with slow-light elements


In this Letter we show that interferometers with unbalanced arm lengths can be balanced using optical elements with appropriate group delays. For matched group delays of the arms, the balanced interferometer becomes insensitive to the frequency noise of the source. For experimental illustration, a ring resonator is employed as a slow-light element to compensate the arm-length mismatch of a Mach–Zehnder interferometer. An arm-length mismatch of 9.4 m9.4 m is compensated by a ring resonator with a finesse of 70 and a perimeter of 42 cm42 cm.

Additional Information

© 2011 Optical Society of America. Received December 7, 2010; revised February 9, 2011; accepted February 10, 2011; posted February 18, 2011 (Doc. ID 139284); published March 10, 2011. The authors thank G. Allen, M. Fejer, S. Fan, and M. Terrel for invaluable discussions and K. Urbanek for experimental support. This work was supported by the National Science Foundation (NSF) under grant 07577896. This paper has been assigned Laser Interferometer Gravitational-Wave Observatory (LIGO) document No. P1000143.

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August 19, 2023
August 19, 2023