Controls of spectral shape and dispersion mismatch for high-resolution optical coherence tomography

I-Jen Hsu; Chia-Wei Sun; Chih-Wei Lu; Chih-Chung Yang; Chung-Ping Chiang; Chii-Wann Lin

doi:10.1117/12.477650

8 July 2003 Controls of spectral shape and dispersion mismatch for high-resolution optical coherence tomography

I-Jen Hsu, Chia-Wei Sun, Chih-Wei Lu, Chih-Chung Yang, Chung-Ping Chiang, Chii-Wann Lin

Proceedings Volume 4956, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VII; (2003) https://doi.org/10.1117/12.477650
Event: Biomedical Optics, 2003, San Jose, CA, United States

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.

Citation Download Citation

I-Jen Hsu, Chia-Wei Sun, Chih-Wei Lu, Chih-Chung Yang, Chung-Ping Chiang, and Chii-Wann Lin "Controls of spectral shape and dispersion mismatch for high-resolution optical coherence tomography", Proc. SPIE 4956, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine VII, (8 July 2003); https://doi.org/10.1117/12.477650

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KEYWORDS

Optical coherence tomography

Light sources

Image processing

Spectral resolution

Control systems

Optical filters

Solids

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