Competence between spatial and temporal coherence in full field optical coherence tomography and interference microscopy

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Abstract

Distinction between spatial and temporal coherence characteristics of the interferogram from low-coherence microscopic systems is investigated. It is shown that the coherence region is determined by the temporal coherence only when the path length difference is scanned in a region where the reference and sample beams are collimated, that is, containing a single spatial frequency. Spatial coherence has an effect when the path length scan is performed with a non-collimated beam, such as a defocus scan of a lens where the focal depth of the lens mainly determines the coherence region. In the latter case, the fringe size for a monochromatic light is smaller than half the wavelength by a factor determined by the spatial coherence. A new analytic relation is derived for the fringe size showing that it has better validity than the Ingelstam relation in the high NA region.

Original languageEnglish
Article number004
Pages (from-to)952-958
Number of pages7
JournalJournal of Optics A: Pure and Applied Optics
Volume8
Issue number11
DOIs
StatePublished - 1 Nov 2006

Keywords

  • Coherence
  • Interference microscopy
  • Optical coherence tomography

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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