In digital holography the sinusoidal interference pattern resulting from the interference between reference and object-wave is stored on a digital receiver, such as CCD or CMOS cameras. The maximum resolution of such receivers (typically 500 lp/mm) is small compared to the typical resolution of photographic plates (3000 lp/mm) originally used in optical holography, which limits the maximum angle between reference and object-wave. Furthermore, the sensor size of digital receivers is small compared to photographic plates. Therefore, the numerically reconstructed hologram possesses larger speckles and the smallest resolvable object detail according to Abbé’s theorem is much larger than in optical holography. The equation for the average speckle-size, taken from [1], and the smallest resolvable object details are represented in Eq. 1. and Eq. 2.
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Acknowledgment
I would like to thank my supervisors Prof. Peter Bryanston-Cross and Dr. Brenda Timmerman for their helpful advices and for making this project possible. Furthermore, I need to express my thanks to the Socrates-Erasmus foundation and the Optical Institute at the Technische Universität Ilmenau, which made Mr. Marco Fritzsche’s stay at the OEL at Warwick possible. Last but not least, I would like to thank IMRC for their financial support of this project and the School Of Engineering technicians for their help manufacturing the necessary devices needed to perform these experiments.
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Claus, D., Fritzsche, M., Timmerman, D.B., Bryanston-Cross, P.P. (2009). Resolution improvement in lensless digital holographic interferometry. In: Osten, W., Kujawinska, M. (eds) Fringe 2009. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03051-2_48
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