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The effect of water dispersion and absorption on axial resolution in ultrahigh-resolution optical coherence tomography

Hillman, T.R. and Sampson, David (2005) The effect of water dispersion and absorption on axial resolution in ultrahigh-resolution optical coherence tomography Optics Express, 13 (6). pp. 1860-1874.

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Abstract

We examine the effects of dispersion and absorption in ultrahigh-resolution optical coherence tomography (OCT), particularly the necessity to compensate for high dispersion orders in order to narrow the axial point-spread function envelope. We present a numerical expansion in which the impact of the various dispersion orders is quantified; absorption effects are evaluated numerically. Assuming a Gaussian source spectrum (in the optical frequency domain), we focus on imaging through water as a first approximation to biological materials. Both dispersion and absorption are found to be most significant for wavelengths above ~1µm, so that optimizing the system effective resolution (ER) requires choosing an operating wavelength below this limit. As an example, for 1-µm source resolution (FWHM), and propagation through a 1-mm water cell, if up to third-order dispersion compensation is applied, then the optimal center wavelength is 0.8µm, which generates an ER of 1.5µm (in air). The incorporation of additional bandwidth yields no ER improvement, due to uncompensated high-order dispersion and long-wavelength absorption.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences
Faculty of Health and Medical Sciences
Authors :
NameEmailORCID
Hillman, T.R.
Sampson, Davidd.sampson@surrey.ac.uk
Date : 2005
DOI : 10.1364/OPEX.13.001860
Uncontrolled Keywords : Absorption, Bandwidth, Frequency domain analysis, Lasers, Medical imaging, Optical resolving power, Optical transfer function, Biological imaging, Dispersion, Optical coherence tomography, Wavelengths, Tomography
Depositing User : Maria Rodriguez-Marquez
Date Deposited : 11 Jun 2018 09:06
Last Modified : 19 Sep 2018 11:32
URI: http://epubs.surrey.ac.uk/id/eprint/846921

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