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Common path Fourier domain optical coherence tomography based on multiple reflections within the sample arm

Krstajic, N., Hogg, R. and Matcher, S.J. (2011) Common path Fourier domain optical coherence tomography based on multiple reflections within the sample arm. Optics Communications, 284 (12). pp. 3168-3172. ISSN 0030-4018

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Abstract

We present a common path Fourier domain optical coherence tomography (FDOCT) setup where the reference signal arises from multiple reflections within the sample arm. Two configurations are demonstrated. The first is based on a reflective microscope objective while the second is based on a normal (refractive) microscope objective. The second configuration is effectively a Mireau interferometer. We present a sensitivity analysis of these setups and images of in vivo skin. Advantages of both common path arrangements include: 1) the reference surface is not close to the sample surface while keeping the optical path lengths matched (so the additional interferometer is not needed) and 2) the user can independently control reference and sample arm power. Additionally, the configuration using the refractive objective ensures that the coherence gate and focus gate always match. A disadvantage is that the reference arm power in certain circumstances is not optimal (i.e. close to saturating the CCD). However, this issue can be removed by a light source of sufficient output power. We believe the idea is scalable and therefore of interest to endoscopy applications. (C) 2011 Elsevier B.V. All rights reserved.

Item Type: Article
Copyright, Publisher and Additional Information: © 2011 Elsevier. This is an author produced version of a paper subsequently published in Optics Communications. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Biomedical optics; Common path interferometry; Low coherence interferometry; Optical coherence tomography; Fourier domain optical coherence tomography
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield)
The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 21 Jun 2011 08:13
Last Modified: 08 Feb 2013 17:32
Published Version: http://dx.doi.org/10.1016/j.optcom.2011.02.073
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.optcom.2011.02.073
URI: http://eprints.whiterose.ac.uk/id/eprint/43092

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