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Proceedings Paper

A fiber-compatible spectrally encoded imaging system using a 45° tilted fiber grating
Author(s): Guoqing Wang; Chao Wang; Zhijun Yan; Lin Zhang
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Paper Abstract

We propose and demonstrate, for the first time to our best knowledge, the use of a 45° tilted fiber grating (TFG) as an infiber lateral diffraction element in an efficient and fiber-compatible spectrally encoded imaging (SEI) system. Under proper polarization control, the TFG has significantly enhanced diffraction efficiency (93.5%) due to strong tilted reflection. Our conceptually new fiber-topics-based design eliminates the need for bulky and lossy free-space diffraction gratings, significantly reduces the volume and cost of the imaging system, improves energy efficiency, and increases system stability. As a proof-of-principle experiment, we use the proposed system to perform an one dimensional (1D) line scan imaging of a customer-designed three-slot sample and the results show that the constructed image matches well with the actual sample. The angular dispersion of the 45° TFG is measured to be 0.054°/nm and the lateral resolution of the SEI system is measured to be 28 μm in our experiment.

Paper Details

Date Published: 29 April 2016
PDF: 7 pages
Proc. SPIE 9896, Optics, Photonics and Digital Technologies for Imaging Applications IV, 98960J (29 April 2016); doi: 10.1117/12.2225140
Show Author Affiliations
Guoqing Wang, Univ. of Kent (United Kingdom)
Chao Wang, Univ. of Kent (United Kingdom)
Zhijun Yan, Aston Univ. (United Kingdom)
Lin Zhang, Aston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 9896:
Optics, Photonics and Digital Technologies for Imaging Applications IV
Peter Schelkens; Touradj Ebrahimi; Gabriel Cristóbal; Frédéric Truchetet; Pasi Saarikko, Editor(s)

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