Piezoelectric scanning mirrors for endoscopic optical coherence tomography
A novel piezoelectric scanning mirror design for endoscopic optical coherence tomography (OCT) is presented. OCT is an interferometric technique providing microscopic tomographic sectioning of biological samples with mm-range penetration capability in tissue and is suited for integration with endoscopes using fiber-based light delivery to the sample. The piezoelectric scanning mirror was designed to provide wide-range rapid forwarding-looking scanning of the optical beam at the distal end of a compact catheter. The optical scanner provides a large ratio of mirror aperture to device size with rectangular mirror sizes ranging from 600 νm × 840 νm to 840 νm × 1600 νm. Static angular displacements up to 7° (mechanical angle) were demonstrated and resonance frequencies of hundreds of Hz (and up to 1-2 kHz) were measured, depending on the mirror size. The imaging capability of the piezoelectric scanner was demonstrated using a bench-top spectrometer-based Fourier-domain OCT system. © 2009 IOP Publishing Ltd.
Gilchrist, KH; McNabb, RP; Izatt, JA; Grego, S
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