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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 19 — Sep. 19, 2005
  • pp: 7548–7562

Optical modeling of an ultrathin scanning fiber endoscope, a preliminary study of confocal versus non-confocal detection

Erek S. Barhoum, Richard S. Johnston, and J. Seibel  »View Author Affiliations

Optics Express, Vol. 13, Issue 19, pp. 7548-7562 (2005)

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An optical model of an ultrathin scanning fiber endoscope was constructed using a non-sequential ray tracing program and used to study the relationship between fiber deflection and collection efficiency from tissue. The problem of low collection efficiency of confocal detection through the scanned single-mode optical fiber was compared to non-confocal cladding detection. Collection efficiency is 40x greater in the non-confocal versus the confocal geometry due to the majority of rays incident on the core being outside the numerical aperture. Across scan angles of 0 to 30°, collection efficiency decreases from 14.4% to 6.3% for the non-confocal design compared to 0.34% to 0.10% for the confocal design. Non-confocality provides higher and more uniform collection efficiencies at larger scan angles while sacrificing the confocal spatial filter.

© 2005 Optical Society of America

OCIS Codes
(170.2150) Medical optics and biotechnology : Endoscopic imaging
(180.1790) Microscopy : Confocal microscopy

ToC Category:
Research Papers

Original Manuscript: August 2, 2005
Revised Manuscript: September 7, 2005
Published: September 19, 2005

Erek Barhoum, Richard Johnston, and Eric Seibel, "Optical modeling of an ultrathin scanning fiber endoscope, a preliminary study of confocal versus non-confocal detection," Opt. Express 13, 7548-7562 (2005)

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