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Proceedings Paper

Optical coherence tomography using a dynamically focusing tunable micro-lens
Author(s): Khaled Aljasem; Armin Werber; Daniel Mader; Stephan Reichelt; Hans Zappe
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Paper Abstract

A fiber-optic-based, time-domain optical coherence tomography (OCT) system coupled with a pneumatically actuated micro-lens is demonstrated. The OCT system uses a superluminescent diode emitting at a center wavelength of &lgr; ≈ 1300 nm. Microsystem fabrication technologies employing polydimethylsiloxane (PDMS) are used to fabricate the micro-lens with an aperture of 2 mm. A B-scan is carried out while dynamically shifting the focal length of the micro-lens along the axial scan. The OCT scan results show a higher lateral resolution and higher contrast of the backscattered interference signals when using the tunable lens; hence, deeper axial scans are possible. The ability to miniaturize the dimensions of the micro-lens will allow the system to be applicable to en-face optical coherence tomography and endoscopic applications.

Paper Details

Date Published: 11 July 2007
PDF: 9 pages
Proc. SPIE 6627, Optical Coherence Tomography and Coherence Techniques III, 662713 (11 July 2007); doi: 10.1117/12.727630
Show Author Affiliations
Khaled Aljasem, Univ. of Freiburg (Germany)
Armin Werber, Univ. of Freiburg (Germany)
Daniel Mader, Albert-Ludwigs-Univ. Freiburg (Germany)
Stephan Reichelt, Univ. of Freiburg (Germany)
Hans Zappe, Univ. of Freiburg (Germany)

Published in SPIE Proceedings Vol. 6627:
Optical Coherence Tomography and Coherence Techniques III
Peter E. Andersen; Zhongping Chen, Editor(s)

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