Experimental study of frequency response in digital holography

In this paper, we present an experimental study of the frequency response in off-axis numerical reconstruction of digitally recorded holograms (DH). Despite of the fact that several works have reported the way how the digital holographic imaging systems deal with the frequency of the imaged objects, all of them are limited to computer modelling. Up to the best knowledge of the authors this is the first attempt to experimentally evaluate the response on frequency of DH. A star test of resolution is imaged in DH to measure the modulation transfer function (MTF), which is quantified as the ratio of the contrast of the reconstructed image over that of the input object. From the measured MTFs, trade-off guides in terms of the frequency response of the DH imaging system can be elaborated as the reduction of data to be processed or data-compressing is of interest.