Ultrasensitive beam deflection measurement via interferometric weak value amplification

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

Research output: Contribution to journalArticlepeer-review

597 Scopus citations


We report on the use of an interferometric weak value technique to amplify very small transverse deflections of an optical beam. By entangling the beam's transverse degrees of freedom with the which-path states of a Sagnac interferometer, it is possible to realize an optical amplifier for polarization independent deflections. The theory for the interferometric weak value amplification method is presented along with the experimental results, which are in good agreement. Of particular interest, we measured the angular deflection of a mirror down to 400±200frad and the linear travel of a piezo actuator down to 14±7fm.

Original languageEnglish (US)
Article number173601
JournalPhysical review letters
Issue number17
StatePublished - Apr 27 2009

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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