Holographic Storage Diffraction Efficiency Control
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Solution Overview
Problem
Holographic storage systems face low diffraction efficiency due to interference between unit frames, leading to defects in existing techniques for reading and writing holograms.
Innovation Solution
A method and system that involve providing a reference light and signal light to record interference gratings on an optical recording medium, with a state controller managing the spatial relationship between lights and the medium to generate interference results from multiple gratings, enhancing diffraction efficiency by controlling the reading and writing phase offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unit frames are stored independently in holographic storage system, then signal independence is achieved, but diffraction efficiency becomes extremely low
Solution Approach 1:
The patent merges multiple independent unit frames into a single hologram by recording their interference patterns simultaneously on the optical recording medium. This combining approach allows multiple signals to be stored together while maintaining their independence through spatial separation in the hologram structure, thereby improving diffraction efficiency without sacrificing signal independence.
Solution Approach 2:
The patent utilizes the spatial dimension of the optical recording medium to store multiple unit frames simultaneously. By recording interference patterns at different spatial positions or with different optical path differences, the system achieves multi-frame storage in a single hologram, transforming the storage approach from sequential to parallel dimension.
2Quantity of substance
If multiple interference gratings are recorded on optical recording medium, then storage capacity is improved, but diffraction efficiency decreases due to interference between gratings
Solution Approach 1:
The patent applies local quality by recording different unit frames at different spatial locations or with different optical characteristics on the optical recording medium. Each grating is recorded with specific local parameters (such as spatial frequency, orientation, or optical path difference) that distinguish it from other gratings, allowing simultaneous storage of multiple frames while minimizing mutual interference and maintaining acceptable diffraction efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves diffraction efficiency by allowing simultaneous reading and writing of multiple interference gratings, reducing the decrease in efficiency caused by phase offsets, and enabling efficient data storage and retrieval in holographic systems.
Implementation Method 1
transferring the reference light and the signal light to an optical recording medium, for recording an interference grating
Implementation Method 2
the interference result is a result that diffraction signals of the M interference gratings interfere to each other
Data Source
AI summary
A method for reading and writing with holographic system includes the following operations: (a) providing a reference light and a signal light; (b) transferring the reference light and the signal light to an optical recording medium, for recording an interference grating; (c) changing the reference light and the signal light and repeating the operations (a) to (b) until M interference gratings are recorded on the optical recording medium; (d) providing a reading light to the optical recording medium, for reading the M interference gratings at the same time to generate an interference result, wherein the interference result is a result that diffraction signals of the M interference gratings interfere to each other; and (e) changing the reading light and repeating the operation (d), for obtaining N interference results. A holographic storage system is also disclosed herein.