title: Focusing and scanning light through a multimode optical fiber using digital phase conjugation.
abstract: We demonstrate for the first time to our knowledge a digital phase conjugation technique for generating a sharp focus point at the end of a multimode optical fiber. A sharp focus with a contrast of 1800 is experimentally obtained at the tip of a 105 μm core multimode fiber. Scanning of the focal point is also demonstrated by digital means. Effects from illumination and fiber bending are addressed.
authors.affiliation: Laboratory of Optics, School of Engineering, École Polytechnique Fédéral de Lausanne (EPFL), Lausanne Switzerland. ioannis.papadopoulos@epfl.ch
authors.forename: Ioannis N
authors.initials: IN
authors.lastname: Papadopoulos
authors.forename: Salma
authors.initials: S
authors.lastname: Farahi
authors.forename: Christophe
authors.initials: C
authors.lastname: Moser
authors.forename: Demetri
authors.initials: D
authors.lastname: Psaltis
mesh_terms: D003460:Crystallization; D004724:Endoscopy / Q000379:methods; D004867:Equipment Design; D005336:Fiber Optic Technology; D006696:Holography / Q000379:methods; D007834:Lasers; D008027:Light; D008029:Lighting; D009391:Nephelometry and Turbidimetry; D055100:Optical Fibers; D055095:Optics and Photonics / Q000379:methods*