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Proceedings Paper

Controls of spectral shape and dispersion mismatch for high-resolution optical coherence tomography
Author(s): I-Jen Hsu; Chia-Wei Sun; Chih-Wei Lu; Chih-Chung Yang; Chung-Ping Chiang; Chii-Wann Lin
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Paper Abstract

The longitudinal resolution of an optical coherence tomography (OCT) system is conventionally defined as the full-width at half maximum (FWHM) of the interference fringe envelope, which depends on the center wavelength as well as the spectral width of the light source. One can obtain an FWHM of an interference fringe envelope larger or smaller than that resulted from a Gaussian spectrum of the same spectral FWHM when the light source spectrum is non-Gaussian distributed. In this paper, we first study the dependencies of OCT resolution on the spectral shape and dispersion mismatch with numerical simulations. We will demonstrate the capability of enhancing the longitudinal resolution of an OCT system with a proper control of spectral distribution and dispersion mismatch. Then, in experiments we built an OCT system with its light source generated from nonlinear optics effects of 12-fsec Ti:sapphire laser pulses in an optical fiber. With proper control of dispersion mismatch between the sample and reference arms, the FWHM of the interference fringe envelope was smaller than that of a Gaussian spectrum with the same spectral FWHM by a factor of two. Furthermore, the side lobes were suppressed with a process algorithm to significantly improve the longitudinal resolution.

Paper Details

Date Published: 8 July 2003
PDF: 5 pages
Proc. SPIE 4956, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VII, (8 July 2003); doi: 10.1117/12.477650
Show Author Affiliations
I-Jen Hsu, National Taiwan Univ. (Taiwan)
Chia-Wei Sun, National Taiwan Univ. (Taiwan)
Chih-Wei Lu, National Taiwan Univ. (Taiwan)
Chih-Chung Yang, National Taiwan Univ. (Taiwan)
Chung-Ping Chiang, National Taiwan Univ. (Taiwan)
Chii-Wann Lin, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 4956:
Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VII
Valery V. Tuchin; Joseph A. Izatt; James G. Fujimoto, Editor(s)

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