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Proceedings Paper

Time-independent dispersion compensation in rapid-scanning optical coherence tomography
Author(s): I-Jen Hsu; Chih-Wei Lu; Meng-Tsan Tsai; Chih Chung Yang
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Paper Abstract

We demonstrate a new method for simultaneous compensation of time-dependent and time-independent second- and third-order dispersion mismatches in an optical coherence tomography (OCT) system. There have been several methods for dispersion compensation in scanning interferometry by translating or tilting the diffraction grating in a rapid-scanning optical delay line (RSODL). Although these methods can provide a time-independent or time-dependent compensation of the second- or third-order dispersion, they cannot compensate the dispersion mismatch at both orders at the same time. However, the effects of both orders of dispersion mismatch caused by different lengths of fibers in the sample and reference arms in a fiber-based OCT system are significant and cannot be neglected. In this paper, we propose a new method for simultaneous compensation of time-dependent and time-independent second- and third-order dispersions by placing and adjusting a prism between the grating and the lens of the RSODL. The resulting dispersion can be calculated from the phase response of the RSODL with ray tracing analysis. The dependence of each order of dispersion on the configuration of the system is discussed with numerical analysis. The effects of the dispersion compensation are demonstrated with experiments.

Paper Details

Date Published: 1 July 2004
PDF: 9 pages
Proc. SPIE 5316, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VIII, (1 July 2004); doi: 10.1117/12.528561
Show Author Affiliations
I-Jen Hsu, National Taiwan Univ. (Taiwan)
Chung Yuan Christian Univ. (Taiwan)
Chih-Wei Lu, National Taiwan Univ. (Taiwan)
Meng-Tsan Tsai, National Taiwan Univ. (Taiwan)
Chih Chung Yang, National Taiwan Univ. (Taiwan)


Published in SPIE Proceedings Vol. 5316:
Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VIII
Valery V. Tuchin; Joseph A. Izatt; James G. Fujimoto, Editor(s)

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