Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 9: Photonics II
Q 9.5: Talk
Monday, February 29, 2016, 15:30–15:45, f342
Characterisation of nanostructured multifocal lenses for use in ophthalmology — •Jürgen Otten1,2,3, Ulf Hinze1, Boris Chichkov1, and Ulrich Teubner2,3 — 1Laser Zentrum Hannover e.V., D-30419 Hannover — 2Institut für Laser und Optik, Hochschule Emden/Leer, D-26723 Emden — 3Institut für Physik, Universität Oldenburg, D-26129 Oldenburg
Cataract surgery is one of the most performed surgeries in industrial nations, leading to many advancements of intraocular lens (IOL) implants. Several lens designs are available. One of them uses a monofocal lens combined with a micron-sized Fresnel Zone Plate, yielding a multifocal lens. The zone plate at hand has been constructed using two-photon-polymerisation (2PP). The optical properties of this lens are characterized. Therefore, an experimental setup is built and automated. The lens is placed in a water filled cuvette and illuminated by a collimated laser beam. Using a camera mounted to a positioning system, the beam profile after passing through the lens is recorded in an image series. This series can be evaluated in regard to the beam profile and the distance of the focal points to the zone plate. Using light with a vacuum wavelength of 532nm, the focal points are expected at distances of 28.9mm, 32mm and 35.8mm. Actual measured distances are 28.8mm, 31.95mm and 35.61mm. The deviations from theoretical and measured results are minor, showing that the fabrication of a multifocal lens employing 2PP poses a reliable production process.