Apparatus and method for phase-encoding off-axis spatial light modulators within holographic data systems

摘要

Embodiment of the present invention includes a spatial light modulator (SLM) typically a holographic optical to reconstruct an optical element element (HOE) is off-axis (off-axis) is used advantageously used to phase encode the object beam emitted from the It comprises amplitude and phase encoded optical system, storage device and method. The optical system is the destination of the beam emitted from the SLM prior to alignment with the spatial light modulator (SLM), a holographic memory cells (HMC), such as data storage devices, graphics memory cells alone (HMC), such as a digital micromirror device (DMD) on and a holographic optical element (HOE) for copying the normal run phase encoding function. SLM induces amplitude modulation on the off-axis one trillion people data beam illuminates the SLM. Conventionally, the phase mask hamgye at least one optical element, including 4-F lens has typically to be phase encoded light pattern amplitude encoding propagating from the SLM. According to an embodiment of the invention, a holographic optical element (HOE) is a phase mask, and replaces the other optical elements, amplitude encoded beam is amplitude encoded before the hole aligned with the graphics memory cells (HMC) for storage therein and it executes the required phase encoding on the beam. A holographic optical element (HOE) is formed with a hole graphic storage material by the interference pattern is a jomyeong station alone as the reference beam in the HOE possible storage methods in the graphic storing material. Once generated, the holographic optical element (HOE) is off-axis amplitude, and phase encoding to the optical spatial light modulator (SLM) the amplitude encoding of the object beam emitted from the phase encoding for the conventional system using a complicated phase mask and conventional 4 It is F instead of the lens system. This manner, the system efficiency is improved by reducing the total optical path length is generated from reducing the number of elements in the immediate optical path of the phase-encoding, thereby reducing the power required for the relevant cost reduction, and system.