Holographic Recording Angle and Phase Control
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Solution Overview
Problem
In optical information recording devices using holography, increasing recording density leads to crosstalk issues due to angle or space distance control, resulting in deteriorated signal quality.
Innovation Solution
An optical information recording device that controls the angle of incidence of a reference beam and the phase of signal and reference beams to suppress crosstalk, ensuring a predetermined phase difference between adjacent pages, thereby maintaining signal quality at high recording densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the angle or space distance is reduced to increase recording density, then the recording density is improved, but the crosstalk component increases and signal quality deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the angle of incidence of the reference beam and the phase of the signal beam. By adjusting these parameters, the system achieves high recording density while maintaining signal quality. The angle control unit varies the reference beam angle within a specific range, and the phase control unit adjusts the signal beam phase to predetermined values, thereby optimizing both recording density and reducing crosstalk.
Solution Approach 2:
The system employs dynamic control mechanisms where the angle control unit continuously adjusts the reference beam angle and the phase control unit dynamically modifies the signal beam phase during the recording process. This dynamic adjustment allows the system to adapt to different recording conditions and maintain optimal performance across multiple pages, effectively managing crosstalk while achieving high density.
2Productivity
If multiple pages are multiplexed with small angle intervals, then the recording capacity is increased, but the crosstalk from adjacent pages increases
Solution Approach 1:
The system performs preliminary action by pre-controlling the phase of the signal beam before recording each page. The phase control unit sets the signal beam phase to predetermined values based on the page number, which prepares the interference pattern to minimize crosstalk from adjacent pages before the actual recording occurs. This preliminary phase adjustment is crucial for maintaining signal quality in high-capacity multiplexed recording.
Solution Approach 2:
The phase control unit acts as an intermediary between the signal beam and the recording medium. By introducing precise phase adjustments, it mediates the interaction between adjacent pages, ensuring that the interference patterns from different pages do not interfere with each other. This intermediary control effectively reduces crosstalk while allowing high page multiplexing capacity.
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 enables high-density recording while maintaining good signal quality by effectively managing crosstalk through precise angle and phase control, allowing for efficient data recovery.
Implementation Method 1
a light source configured to emit a laser beam
Implementation Method 2
an optical element configured to divide the laser beam into the reference beam and the signal beam
Implementation Method 3
controlling an angle interval between the pages so that, with respect to each of the pages, a change of a position of a 1st null of crosstalk from an adjacent page is decreased
Implementation Method 4
recording an interference pattern of a signal beam and a reference beam as a hologram
Implementation Method 5
controlling a phase of the signal beam so that a phase difference between adjacent pages is a predetermined value
Data Source
AI summary
The optical information recording device includes a light source configured to emit a laser beam, an optical element configured to divide the laser beam into the reference beam and the signal beam, an angle control unit configured to control an angle of incidence of the reference beam on the optical information recording medium, and a phase control unit configured to control a phase of at least one of the signal beam and the reference beam in a recording period, wherein the angle control unit controls an angle interval so that a position of a 1st null of an adjacent page of the signal beam is fixed, and wherein the phase control unit controls the phase of the signal beam or the reference beam so that a phase difference between the adjacent pages is a predetermined value.