The holographic data storage possesses ultra-high capacity and two-dimensional access technology. It is regarded as the most promising storage technology in the next generation. Based on VOHIL and scalar diffraction theory, we construct the theoretical model of the collinear holographic data storage system. According to the theoretical model, we derive the paraxial solution, which can help us to grasp the physical characteristics and propose the best solution. First, we discuss the effects of the distribution of the reference patterns on the point spread function and the shift selectivity in this paper. Then, we add the phase modulation in the reference pattern. It facilitates the lower power of the laser light source and miniaturization of the system. What's more, it decreases the half width of the point spread function. By adding more bits within per page, we enhance the capacity and accessing speed synchronously.
展开▼
