Spatial Light Modulator Phase Polarization Control for Optical Data Storage
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Solution Overview
Problem
Current optical data storage systems face inefficiencies in writing data to glass substrates due to the need for uniform symbol distribution across voxels, leading to unpredictable laser power utilization and reduced throughput when writing inequivalent data values simultaneously.
Innovation Solution
The system employs a high-power laser with an electronically addressable liquid-crystal spatial light modulator (LCSLM) to divide the laser wavefront into multiple child beams, each with controlled phase and polarization, allowing simultaneous writing of inequivalent data values to different voxels on a substrate by modulating the phase and polarization of the wavefront.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform symbol distribution is enforced across voxels, then data storage uniformity is improved, but laser power utilization efficiency deteriorates and throughput is reduced
Solution Approach 1:
The patent applies local quality by allowing different data values to be written to different voxels with inequivalent laser power requirements. Instead of enforcing uniform symbol distribution, the system writes inequivalent data values (e.g., different pixel intensities or patterns) to different spatial locations, where each location can be optimized for its specific data content. This enables higher throughput by writing multiple inequivalent data values simultaneously without being constrained by the need for uniform power distribution across all voxels.
2Adaptability or versatility
If multiple active modulators are used to control phase and polarization, then data writing flexibility is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using a single spatial light modulator (SLM) that can perform multiple functions: phase modulation, polarization modulation, and beam shaping. The SLM is configured to modulate both the phase and polarization of laser beams simultaneously, eliminating the need for separate modulators for each function. This multi-functional approach maintains data writing flexibility while significantly reducing device complexity.
3Productivity
If laser power is increased to write inequivalent data values simultaneously, then writing speed is improved, but energy consumption and power wastage increase
Solution Approach 1:
The patent applies dynamics by using a spatial light modulator that can dynamically adjust the phase and polarization of laser beams on a pixel-by-pixel basis. This dynamic control allows the system to optimize laser power distribution according to the specific data values being written to each voxel, rather than using uniform high power across all voxels. The SLM can create focused beams with appropriate intensity profiles, enabling high writing speed while minimizing energy consumption by avoiding unnecessary power in regions where lower power suffices.
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 approach enables efficient parallel data writing with improved throughput and reduced power wastage by independently controlling the phase and polarization of each child beam, allowing for simultaneous writing of multiple data values without the need for multiple active modulators, thus enhancing the bandwidth and efficiency of the optical data storage process.
Implementation Method 1
The laser is configured to emit a pulsed wavefront having uniform phase and polarization
Implementation Method 2
The imaging optic is configured to modulate the phase and polarization of different portions of the wavefront by different amounts, and to diffract light from the different portions to a substrate
Implementation Method 3
The imaging optic is configured to modulate the phase and polarization of different portions of the wavefront by different amounts
Implementation Method 4
The imaging optic is configured to modulate the phase and polarization of different portions of the wavefront by different amounts
Implementation Method 5
The irradiance induces a long-lived lattice perturbation at its focus, which derives from non-linear, two-photon absorption by the substrate
Implementation Method 6
High-power, short-pulse laser irradiance can be used to write and store data within a glass substrate
Implementation Method 7
Data written to a glass substrate in this manner can be read back using a polarized optical beam to interrogate the various grating-like perturbations formed within it
Data Source
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AI summary
An optical data-storage system comprises a laser, an imaging optic, and associated computer logic. The laser is configured to emit a pulsed wavefront having uniform phase and polarization. The imaging optic is configured to modulate the phase and polarization of different portions of the wavefront by different amounts, and to diffract light from the different portions to a substrate with writeable optical properties. The logic is configured to receive data and to control modulation of the phase and polarization such that the light diffracted from the imaging optic writes the data to the substrate.