Continuous phase amplification with a Sagnac interferometer

David J. Starling, P. Ben Dixon, Nathan S. Williams, Andrew N. Jordan, John C. Howell

Research output: Contribution to journalArticlepeer-review

118 Scopus citations


We describe a phase-amplification technique using a Sagnac interferometer. We monitor the relative phase between two paths of a precisely misaligned interferometer by measuring the average position of a split-Gaussian mode in the dark port. Although we monitor only the dark port, we show that the signal varies linearly with phase and that we can obtain similar sensitivity to balanced homodyne detection. We derive the source of the amplification using classical wave optics.

Original languageAmerican English
Article number011802
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
StatePublished - 8 Jul 2010
Externally publishedYes


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