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Proceedings Paper

Axicon lens for high-resolution optical coherence tomography over a long focus depth
Author(s): Zhihua Ding; Hongwu Ren; Yonghua Zhao; J. Stuart Nelson; Zhongping Chen
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Paper Abstract

In optical coherence tomography (OCT), axial and lateral resolutions are determined by the source coherence length and numerical aperture of the sampling lens, respectively. While axial resolution can be improved using a broadband light source, there is a trade-off between lateral resolution and focus depth when conventional optical elements are used. In this paper, we report on the incorporation of an axicon lens into the sample arm of the interferometer to overcome this limitation. Using an axicon lens with a top angle of 160 degrees, 10 micrometers or better lateral resolution is maintained over a focus depth of at least 6 mm. In addition to high lateral resolution, the focusing spot intensity is approximately constant over the whole focus depth.

Paper Details

Date Published: 14 June 2002
PDF: 6 pages
Proc. SPIE 4619, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI, (14 June 2002); doi: 10.1117/12.470468
Show Author Affiliations
Zhihua Ding, Beckman Laser Institute and Medical Clinic (United States)
Hongwu Ren, Beckman Laser Institute and Medical Clinic (United States)
Yonghua Zhao, Beckman Laser Institute and Medical Clinic (United States)
J. Stuart Nelson, Beckman Laser Institute and Medical Clinic (United States)
Zhongping Chen, Beckman Laser Institute and Medical Clinic (United States)


Published in SPIE Proceedings Vol. 4619:
Coherence Domain Optical Methods in Biomedical Science and Clinical Applications VI
Valery V. Tuchin; Joseph A. Izatt; James G. Fujimoto, Editor(s)

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