Precision angle sensor using an optical lever inside a Sagnac interferometer

J. M. Hogan, J. Hammer, S. W. Chiow, S. Dickerson, D. M.S. Johnson, Timothy Light Kovachy, A. Sugarbaker, M. A. Kasevich

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


We built an ultra-low-noise angle sensor by combining a folded optical lever and a Sagnac interferometer. The instrument has a measured noise floor of 1:3 prad/√Hz at 2:4 kHz. We achieve this record angle sensitivity using a proof-of-concept apparatus with a conservative N = 11 bounces in the optical lever. This technique could be extended to reach subpicoradian//√Hz sensitivities with an optimized design.

Original languageEnglish (US)
Pages (from-to)1698-1700
Number of pages3
JournalOptics Letters
Issue number9
StatePublished - May 1 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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