Resolution enhancement in digital holography by a two-dimensional electro-optically tunable phase grating

摘要

Digital Holography (DH) provide coherent imaging in microscopy for a variety of applications such as characterization of silicon MEMS, three dimensional imaging [1,2], particle image analysis [3,4]. The potential applications of DH have been extended to a wide spectral range, from far IR [5] to deep UV [6]. The computational image reconstruction from a digital hologram has many advantages compared to the traditional optical holography, including amplitude and phase imaging, 3D imaging and the digital wavefront manipulation. On the other hand, some disadvantages also exist. In fact, no electronic device is able to compete with the high resolution (up to 5000 lines/mm) of the photographic emulsions used in optical holography. Therefore, in most cases, the resolution achieved in DH is too low and not qualified for practical applications.