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Submicrometer axial resolution optical coherence tomography

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Abstract

Optical coherence tomography (OCT) with unprecedented submicrometer axial resolution achieved by use of a photonic crystal fiber in combination with a compact sub-10-fs Ti:sapphire laser (Femtolasers Produktions) is demonstrated for what the authors believe is the first time. The emission spectrum ranges from 550 to 950 nm (λc=725 nm, Pout=27 mW), resulting in a free-space axial OCT resolution of 0.75 µm, corresponding to 0.5 µm in biological tissue. Submicrometer-resolution OCT is demonstrated in vitro on human colorectal adenocarcinoma cells HT-29. This novel light source has great potential for development of spectroscopic OCT because its spectrum covers the absorption bands of several biological chromophores.

© 2002 Optical Society of America

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