High-visibility interferometric measurement of the diffraction phase

Salvador Barraza-Lopez, Daniel F.V. James, Paul G. Kwiat

Research output: Contribution to journalArticlepeer-review


We obtain the absolute phase in Fresnel diffraction for Gaussian beams by using a modified polarization Sagnac interferometer in which counterpropagating paths are spatially separated and labeled according to polarization. By erasing the polarization "which-path" information with an analyzing polarizer situated after the modified interferometer, we are able to regain interference and to precisely control the relative intensities of the diffracted and the reference beams. The resulting optimized visibility allows for a precise phase determination. This setup is very stable, requiring no active elements.

Original languageEnglish (US)
Pages (from-to)1148-1155
Number of pages8
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Issue number4
StatePublished - Apr 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition


Dive into the research topics of 'High-visibility interferometric measurement of the diffraction phase'. Together they form a unique fingerprint.

Cite this