Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: New Instruments and Methods
CPP 8.6: Poster
Monday, March 11, 2013, 17:30–19:30, Poster C
Determination of the Modulation Transfer Function in a Holographic 2D-Data Storage System — •Christoph Meichner1, Lothar Kador1, Christian Probst2, and Hans-Werner Schmidt2 — 1University of Bayreuth, Institute of Physics and Bayreuther Institut für Makromolekülforschung (BIMF), 95440 Bayreuth, Germany — 2University of Bayreuth, Macromolecular Chemistry I and Bayreuther Institut für Makromolekülforschung (BIMF), 95440 Bayreuth, Germany
A holographic storage set-up was improved and characterized which is able to inscribe entire data pages into azobenzene-based media by means of a spatial light modulator (SLM). For the quantitative characterization of the imaging quality a fast and reliable method is required, which does not need every digital bit to be read out. To this end a simple measurement was performed which is based on the determination of the contrast of different periodical structures displayed on the SLM. The change in contrast of sinusoidal intensity patterns transferred through the optical system is analyzed with the hologram read-out camera in two directions perpendicular to the optical axis. The contrast as a function of the spatial frequency displayed on the SLM provides the data to calculate the modulation transfer function of the system. The experiments demonstrate the optical limitations of the set-up and the degree by which they are affected by the storage medium. In this way they yield information about the amount of storable data which is one of the key quantities in holographic data storage.