Optical technologies have recently been employed in data security. Compared with traditional computer and electrical systems, optical technologies offer primarily two types of benefits. Recently we have proposed several security systems that are based on existing optical correlators but has some additional benefits over those of the present generation. These systems have better security level more functions and they might be useful for more purposes. Longitudinal beam shaping Recently we have started to explore the field of longitudinal holography.
Longitudinal holography is the method to shape the light distribution along the propagation axis.
While an ordinary hologram is a transmission mask, typically employed to construct a desired transverse image, the longitudinal hologram is a special transmission mask that is used to achieve a desired longitudinal light distribution. For example, by inserting the longitudinal hologram in the propagation path of the laser beam, its divergence can be avoided so that the beam radius remains constant along an arbitrary axial distance. Currently we extend our research to the 3-D computer generated holography. The goal of this project is to find efficient methods of computing synthetic holograms, which are capable of creating artificial 3-D images in the observer eyes. Recently we have developed a novel method of hologram recording.