Polarization effect on the depth resolution of optical coherence tomography

Shuliang Jiao, Marco Ruggeri

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We find for the first time that polarization mismatch of the sample and reference arms in optical-fiberbased optical coherence tomography (OCT) has critical effect on its depth resolution when the light source is partially polarized. When the polarization states of the two arms are matched, the measured point spread function (PSF) is almost identical to the theoretical prediction. When their polarization states are mismatched, the PSF can be so distorted that the depth resolution is degraded to several times the theoretical value. When we polarize the source light with a polarizer, then the degree of polarization (DOP) is unity, and the depth resolution becomes independent of the polarization mismatch. This discovery has fundamental importance for high-resolution OCT imaging of biological tissues. With DOP<1, the depth resolution can be quickly degraded by either birefringence or scattering in the sample. Adjusting polarization controllers can only improve the depth resolution at a certain depth in a sample if the polarization state of light changes along the depth. When DOP=1, uniform resolution along the depth of a sample can be achieved.

Original languageEnglish (US)
Article number060503
JournalJournal of Biomedical Optics
Volume13
Issue number6
DOIs
StatePublished - 2008

Fingerprint

Optical tomography
tomography
Polarization
polarization
Optical transfer function
point spread functions
Light sources
light sources
Birefringence
polarizers
birefringence
unity
controllers
adjusting
Scattering
Tissue
Imaging techniques
Controllers
high resolution
predictions

Keywords

  • Coherence
  • Imaging
  • Interferometers
  • Polarization
  • Resolution

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biomaterials
  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

Cite this

Polarization effect on the depth resolution of optical coherence tomography. / Jiao, Shuliang; Ruggeri, Marco.

In: Journal of Biomedical Optics, Vol. 13, No. 6, 060503, 2008.

Research output: Contribution to journalArticle

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