Concentrically Symmetric Hollow Core Interferometer for Common Path Optical Coherence Tomography


A hollow core, concentrically symmetric, beam splitting, Michaelson interferometer for common-path, Fourier-domain Optical Coherence Tomography has been demonstrated and analyzed. The key component of the system is a compact, small diameter probe composed of a collimating lens, hollow core beam splitting tube, and a focusing lens. The beam splitting tube is created by sputter coating the distal endface of a finely polished thick wall capillary tube with a highly reflective gold layer. Light from a coherent source is coupled into the tube. Part of the light travels through the wall of the tube is reflected by the distal endface forming a reference arm and part passes through the hollow core to be backscattered by the sample material forming a sample arm. To demonstrate the functionality and utility of the probe, cross-sectional and volumetric images of various samples have been obtained. Some advantages of this system include a small probe diameter and an easily adjustable working distance.

Meeting Name

57th International Instrumentation Symposium (2011: Jun. 20-24, St. Louis, MO)


Electrical and Computer Engineering

Keywords and Phrases

Common path; Concentric; Endoscopic; Fourier-domain; Hollow; In-axis; OCT; Gold coatings; Interferometers; Optical tomography; Probes; Tubes (components)

International Standard Book Number (ISBN)


Document Type

Article - Conference proceedings

Document Version


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© 2011 International Society of Automation, All rights reserved.

Publication Date

01 Jun 2011