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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 1 — Jan. 3, 2011

Optical design of a line-focused forward-viewing scanner for optical coherence tomography

Mohammad Kamal, Sivakumar Narayanswamy, and Muthukumaran Packirisamy  »View Author Affiliations

Applied Optics, Vol. 49, Issue 31, pp. 6170-6178 (2010)

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We report an optical design of a line-focused forward-viewing optical coherence tomography (OCT) scanner for high-speed endoscopic imaging. To avoid a complex lens system, an off-axis cylindrical mirror is used for focusing the line illumination onto the sample surface. Because of its insensitivity to the broadband spectrum, the mirror-focused scanner improves the image quality compared to a lens-focused scanner. In this work, a feasibility study is carried out on the use of a reflective-optics-focused line scanner in OCT imaging, instead of the traditional refractive optics scanner. The Strehl ratio, chromatic focal shift, and field analysis were carried out for a plano-convex cylindrical lens, an achromatic cylindrical lens, and a cylindrical-mirror-focused scanner. ZEMAX optical modeling analysis showed that mirror-focused scanning provides better Strehl ratio in comparison to plano-convex cylindrical-lens-focused scanning, and that the Strehl ratio is comparable to achromatic cylindrical-lens-focused scanning. However, field anal ysis on the edges of the scanning elements within the scan range shows that mirror-focused scanning is more robust when compared to a cylindrical achromatic lens. Overall, a mirror-focused scanner shows better performance compared to lenses.

© 2010 Optical Society of America

OCIS Codes
(120.5800) Instrumentation, measurement, and metrology : Scanners
(170.2150) Medical optics and biotechnology : Endoscopic imaging
(170.4500) Medical optics and biotechnology : Optical coherence tomography
(220.4830) Optical design and fabrication : Systems design

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: May 6, 2010
Revised Manuscript: September 28, 2010
Manuscript Accepted: September 29, 2010
Published: October 29, 2010

Virtual Issues
Vol. 6, Iss. 1 Virtual Journal for Biomedical Optics

Mohammad Kamal, Sivakumar Narayanswamy, and Muthukumaran Packirisamy, "Optical design of a line-focused forward-viewing scanner for optical coherence tomography," Appl. Opt. 49, 6170-6178 (2010)

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