Are you an EPFL student looking for a semester project?
Work with us on data science and visualisation projects, and deploy your project as an app on top of GraphSearch.
Multimode fiber endoscopes have recently been shown to provide sub-micrometer resolution, however, imaging through a multimode fiber is highly sensitive to bending. Here we describe the implementation of a coherent beacon source placed at the distal tip of the multimode fiber, which can be used to compensate for the effects of bending. In the first part of this paper, we show that a diffraction limited focused spot can be generated at the distal tip of the multimode fiber using the beacon. In the second part, we demonstrate focusing even when the fiber is bent by dynamically compensating for it. The speckle pattern at the proximal fiber end, generated by the beacon source placed at its distal end, is highly dependent on the fiber conformation. We experimentally show that by intensity correlation, it is possible to identify the fiber conformation and maintain a focus spot while the fiber is bent over a certain range. Once the fiber configuration is determined, previously calibrated phase patterns could be stored for each fiber conformation and used to scan the distal spot and perform imaging. (c) 2013 Optical Society of America
Loading
Loading
Loading
Loading
Loading
Salma Farahi, Alexandre Goy, Damien Claude-Marie Loterie, Christophe Moser, Ioannis Papadopoulos, Demetri Psaltis
Donald Benjaman Conkey, Christophe Moser, Demetri Psaltis, Nicolino Stasio
Donald Benjaman Conkey, Eirini Kakkava, Damien Claude-Marie Loterie, Christophe Moser, Demetri Psaltis, Marilisa Romito