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RESEARCH PRODUCT

Parallel Phase-Shifting Digital Holography Based on the Fractional Talbot Effect

subject

description

Digital holography allows us to record and process digitally the complex amplitude distribution associated to diffracted light beams and therefore has offered new possibilities for a variety of applications such as 3D microscopy, interferometry, or information security (see, for example, review [1]). In principle, phase-shifting techniques are the most efficient in terms of spatial resolution to record digital holograms [2]. However, a sequential acquisition of several interference patterns with different phase retardations of the reference beam is necessary, preventing dynamic measurements. Different techniques for time-resolved dynamic interferometry have been developed allowing one-shot operation and acquisition times only limited by the sensor capabilities [3–5]. However, they require designing complex diffractive optical elements or periodic pixelated polarization devices, which are difficult to build and hard to integrate with the CCD sensor.