Compact OCT probe for flexible endoscopy enabled by piezoelectric scanning of a fiber/lens assembly

Ronak Narendra Shah; Simon Kretschmer; Julian Nehlich; Çağlar Ataman; Hans Zappe

doi:10.1117/12.2508481

4 March 2019 Compact OCT probe for flexible endoscopy enabled by piezoelectric scanning of a fiber/lens assembly

Ronak Narendra Shah, Simon Kretschmer, Julian Nehlich, Çağlar Ataman, Hans Zappe

Proceedings Volume 10931, MOEMS and Miniaturized Systems XVIII; 109310A (2019) https://doi.org/10.1117/12.2508481
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

We present a forward-looking OCT probe featuring a piezoelectric tube actuated resonant fiber scanner providing a fieldof-view of up to 1.8 mm with a lateral resolution of 12 μm. The fully packaged final probe has a total length of 11.3 mm and an outer diameter of 4 mm. The probe is designed to operate in contact mode, and can further be shortened by more than 30%, if configured to operate at a distance from tissue. The scanning fiber bears at its tip a plano-convex imaging lens of 1 mm diameter and 0.6 mm focal length. The two components are assembled via an ultra-high-precision holder, fabricated by a two-photon polymerization based 3D printing tool. This method provides an alignment accuracy better than 1 μm along all axes of the scanning fiber, leading to a good control of both the imaging parameters and the scan pattern around the resonance peak. Furthermore, using a plano-convex lens instead of a GRIN lens provides the same optical functionality within a significantly shorter length and facilitates further miniaturization. Using this probe, we demonstrate 3D OCT measurements of standard calibration targets and in-vivo tissue measurements performed on human skin.

Conference Presentation

Citation Download Citation

Ronak Narendra Shah, Simon Kretschmer, Julian Nehlich, Çağlar Ataman, and Hans Zappe "Compact OCT probe for flexible endoscopy enabled by piezoelectric scanning of a fiber/lens assembly ", Proc. SPIE 10931, MOEMS and Miniaturized Systems XVIII, 109310A (4 March 2019); https://doi.org/10.1117/12.2508481

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