Holographic Data Reading via Shearing Interferometry
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Solution Overview
Problem
Holographic storage devices face inefficiencies in reading data due to the need for repeated readings of diffracted light beams to accurately calculate data, which prolongs the reading process and decreases efficiency.
Innovation Solution
A holographic device employs a shearing interferometer to transform diffracted light beams into first and second light beams, allowing for the calculation of data storage cell phases using an initial reference signal point, enabling data to be read once and improving reading efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the diffracted light beam is read multiple times by the receiver to accurately calculate data and eliminate noise, then the measurement precision is improved, but the productivity deteriorates due to extended reading time
Solution Approach 1:
The patent applies preliminary action by performing phase calculation through shearing interferometry before final data compilation. The system calculates phase information from the diffracted light beam in advance, creating intermediate results that can be directly used for data reconstruction. This preliminary phase calculation eliminates the need for multiple repeated readings, as the phase information is extracted and processed beforehand, thereby maintaining measurement precision while significantly improving reading efficiency and reducing compilation time.
2Reliability
If the diffracted light beam is read multiple times to eliminate noise, then the reliability is improved, but the loss of time increases due to repeated reading operations
Solution Approach 1:
The patent replaces the mechanical repeated reading process with an optical interference-based phase calculation system. Instead of mechanically repeating the reading operation multiple times to eliminate noise, the system uses shearing interferometry to optically extract phase information from a single reading of the diffracted light beam. This substitution of the mechanical repeated reading mechanism with an optical phase calculation approach maintains data reliability and noise elimination while dramatically reducing the time loss associated with multiple reading operations.
3Measurement precision
If the reading operation is performed repeatedly to accurately compile diffracted light beam into digital data, then the measurement precision is improved, but the duration of action increases
Solution Approach 1:
The patent applies preliminary action by performing phase calculation through shearing interferometry before final data compilation. The system calculates phase information from the diffracted light beam in advance, creating intermediate results that can be directly used for data reconstruction. This preliminary phase calculation eliminates the need for multiple repeated readings, as the phase information is extracted and processed beforehand, thereby maintaining measurement precision while significantly improving reading efficiency and reducing compilation time.
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
This method shortens the time required to read data while maintaining high quality, enhancing the reading performance and efficiency of the holographic device by allowing phase information to be obtained in a single read operation.
Implementation Method 1
The shearing interferometer is configured to receive the diffracted light beam and to transform the diffracted light beam into a first light beam and a second light beam
Implementation Method 2
The holographic storage device is configured to provide a disk with a reading light beam to make the reading light beam become a diffracted light beam after the reading light beam is diffracted in the disk
Data Source
AI summary
A holographic device includes a holographic storage device, a shearing interferometer, and an optical receiver. The holographic storage device is configured to provide a disk with a reading light beam to make the reading light beam become a diffracted light beam after the reading light beam is diffracted in the disk. The shearing interferometer is configured to receive the diffracted light beam and to transform the diffracted light beam into a first light beam and a second light beam. The optical receiver is configured to receive the first light beam and the second light beam provided by the shearing interferometer.