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Optical Engineering

Comparison of different focusing systems for common-path optical coherence tomography with fiber-optic bundle as endoscopic probe
Author(s): Weichao Wang; Kang Zhang; Qiushi Ren; Jin Ung Kang
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Paper Abstract

A fiber-optic bundle-based submillimeter probe for endoscopic common-path optical coherence tomography with focusing system is presented. Three different focusing systems, bulk lenses, a gradient index (GRIN) lens, and a microlens array, are proposed and compared. The simulation results show that all the focusing systems can focus the beam with different degrees of effectiveness. The major differences between the different focusing systems exist in the beam size and the divergence angle between the inner and outer pixels of the fiber bundle. The microlens array shows the smallest change in beam size from the central fiber to the outermost fiber, while the GRIN lens exhibits the largest. Signal-to-noise ratio of the system, taking attenuation and cross talk between adjacent pixels of the fiber bundle into account, is also analyzed.

Paper Details

Date Published: 1 October 2009
PDF: 8 pages
Opt. Eng. 48(10) 103001 doi: 10.1117/1.3250270
Published in: Optical Engineering Volume 48, Issue 10
Show Author Affiliations
Weichao Wang, Shanghai Jiao Tong Univ. (China)
Kang Zhang, The Johns Hopkins Univ. (United States)
Qiushi Ren, Shanghai Jiao Tong Univ. (China)
Jin Ung Kang, The Johns Hopkins Univ. (United States)

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