Micromachined array tip for multifocus fiber-based optical coherence tomography

Abstract

High-resolution optical coherence tomography demands a large detector bandwidth and a high numerical aperture for real-time imaging, which is difficult to achieve over a large imaging depth. To resolve these conflicting requirements we propose a novel multifocus fiber-based optical coherence tomography system with a micromachined array tip. We demonstrate the fabrication of a prototype four-channel tip that maintains a $9–14‐\mathit{\mu }\mathrm{m}$ spot diameter with more than $500 \mathit{\mu }\mathrm{m}$ of imaging depth. Images of a resolution target and a human tooth were obtained with this tip by use of a four-channel cascaded Michelson fiber-optic interferometer, scanned simultaneously at 8 kHz with geometric power distribution across the four channels.

© 2004 Optical Society of America

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