Simulation, registration, and reconstruction of digital holograms of arbitrary objects by means of liquid crystal on silicon spatial light modulator

Abstract

Each hologram: optical, digital and computer generated represents the phase and amplitude of an object. Therefore the process of object reconstruction may rely on one of two alternative procedures: optoelectronic direct reconstruction of hologram, which is represented by diffractive structure intensity, and recombining of object phase and amplitude as calculated from wavefront propagation process (here the method is based on singular wave component that is derived from a rigorous Sommerfeld's solution) or numerical reconstruction of digital hologram.In the paper we present the comparison of these two ways of optoelectronic reconstruction. The pros and cons for application of these procedures from image quality point of view are given. The experimental systems based on a Twyman-Green interferometer with two phase and amplitude LCOS or on a single digital hologram or computer generated hologram reconstruction setup are presented. The conclusions of these experiments will be utilized for optimizing of the process of production of security holograms with use of LCOS modulators.

Digital holocameras for laboratory and outdoor measurements of engineering objects

“…Electronic module with laser and PZT controllers and synchronization is separated from holographic head. Also for specific applications the cameras are equipped with the remote data transfer and used for both numerical or optoelectronic distance reconstruction systems 5,6 .…”

Digital holographic cameras and data processing for remote monitoring and measurements of mechanical parts

“…The hardware and software solutions are different for both systems and therefore in order to provide the user friendly cameras for mechanical engineers, two separate devices have been designed and built, i.e., DH_SHAPE and DH_UVW. Also, for specific applications, the cameras are equipped with the remote data transfer and used for both numerical or optoelectronic distance reconstruction systems [3,7].…”

“…Those SLM's have better fill factor, diffraction efficiency, and smaller pixel size comparing to standard SLM's. Two types of devices can be used for reconstruction, phase and amplitude type LCOS [7,13].…”

“…It also allows for distant monitoring of an object and its remote, optoelectronic reconstruction [3,4]. Proper manipulation of phases, which is equivalent or goes beyond the conventional holographic interferometry [5,6] provides information about shape of an object, its out-of-plane and in-plane displacements during internal or external loading [3,7,8]. All these capabilities locate digital holographic interferometry among the methods with high potential for industrial and outdoor measurement applications.…”