Holographic data recording apparatus and method

Abstract

A holographic data recording device, comprising: a signal beam patterning unit, used to radiate a signal beam to a holographic medium, the signal beam includes a data pattern to be recorded; a cylindrical optical body, including a cylindrical reflecting surface, through which the cylindrical optical body makes The first and second reference beams that are alternately incident on it at respective incident angles are alternately reflected toward the holographic medium; the incident angle control unit is used to control the incident angles of the first and second reference beams incident on the cylindrical optical body , wherein the data pattern is recorded on the holographic medium by interference of the signal beam with the first and second reference beams on the holographic medium. The holographic data recording device does not need to replace conventional conical mirrors when recording a lot of data on the holographic medium, thereby increasing the recording speed and reducing its manufacturing cost.

Description

field of invention [0001] The present invention relates to a holographic data recording device and method; in particular, to a holographic data recording device and method capable of recording multiple pieces of holographic data on a holographic medium through angle multiplexing by using a columnar optical body. Background of the invention [0002] Conventional holographic memory systems generally adopt a page-by-page storage method. An input device such as an SLM (spatial light modulator) displays the data to be recorded in a two-dimensional array (called a page), while a detector array such as a CCD camera is used to retrieve the recorded data on readout . Other structures have also been proposed in which bit-by-bit recording is used instead of the page-by-page approach. However, all of these systems suffer from the common disadvantage that they need to record a huge number of individual holograms in order to fill the memory up to its maximum capacity. A typical page-or...

AI Technical Summary

Problems solved by technology

[0011] However, conventional holographic data recording devices have the problem that in order to reflect the reference beam toward the disk-shaped holographic medium at a desired incident angle, it is necessary to use a conical mirror having a specific base angle that can provide the required required angle of incidence

Thus, in order to record multiple pieces of holographic data on the holographic medium through angle multiplexing, the number of conical mirrors required must be the same as the number of incident angles of the reference beam required, thereby increasing the cost of the holographic data recording device

[0012] Also, replacing each conical mirror is a difficult and complicated process, reducing recording speed

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