Holographic Light-Emitting Module With Orthogonal Beam Polarization
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Solution Overview
Problem
Holographic storage systems face inefficiencies in data storage capacity and writing speed due to limitations in the interaction between signal and reference light beams, leading to energy waste and reduced usage of photosensitive materials.
Innovation Solution
A holographic light-emitting module configures a reference light beam to be surrounded by a signal light beam, with orthogonal polarizations, using a light shape control module that includes components like polarizing beam splitters, half-wavelength plates, and light-blocking components to optimize the overlap and energy distribution of the light beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the reference light beam is placed at the center without being surrounded by the signal light beam, then the optical path is simpler, but the incident area of the signal light beam is reduced, limiting data storage capacity
Solution Approach 1:
The patent applies the nesting principle by placing the reference light beam inside the signal light beam, creating a concentric configuration where the reference beam is surrounded by the signal beam. This nested arrangement maximizes the incident area of the signal light beam on the photosensitive medium, thereby increasing data storage capacity without significantly complicating the optical path.
Solution Approach 2:
The patent transitions from a conventional side-by-side or sequential beam arrangement to a spatial overlay configuration where beams are arranged in different spatial dimensions (concentric circles). This dimensional reorganization allows both beams to occupy the same optical path space efficiently, increasing the effective incident area while maintaining manageable optical path complexity.
2Quantity of substance
If the incident area of the signal light beam is increased to store more data per page, then the data storage capacity improves, but the writing operation time increases
Solution Approach 1:
The patent ensures continuous and efficient interaction between the signal light beam and the photosensitive medium by optimizing the beam configuration. The surrounded beam arrangement maximizes the incident area, allowing continuous writing operations across the entire photosensitive surface without interruptions or repositioning, thereby increasing both storage capacity and writing speed simultaneously.
3Productivity
If the signal light beam and reference light beam have significant overlap, then the usage rate of photosensitive material improves, but the polarization control becomes more difficult
Solution Approach 1:
The patent applies local quality by assigning different polarization states to different regions or aspects of the light beams. The signal light beam and reference light beam are configured with orthogonal polarizations in the overlap region, allowing efficient interaction with the photosensitive material while maintaining distinguishable polarization characteristics that simplify control and detection.
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 configuration increases the data storage capacity per unit time, enhances the writing speed, and improves the usage rate of photosensitive materials, thereby increasing the efficiency of the holographic storage system.
Implementation Method 1
a half-wavelength plate, a first light-blocking component, and a light-converging module. The light-splitting module is configured to receive the signal light beam and the reference light beam propagated from the light source module and to guide and emit the signal light beam and the reference light beam
Implementation Method 2
The light-converging module is disposed in an optical path of the reference light beam and configured to converge the reference light beam. A cross-sectional area of the converged reference light beam corresponds to a cross-sectional area of the hollow area of the signal light beam
Implementation Method 3
The first light-blocking component is disposed in an optical path of the signal light beam and configured to block a portion of the signal light beam, such that the signal light beam passing through the first light-blocking component is hollow
Implementation Method 4
The light-splitting module includes a first polarizing beam splitter and a second polarizing beam splitter. The first polarizing beam splitter is configured to receive the signal light beam and the reference light beam propagated from the light source module
Implementation Method 5
The first light-guiding module is configured to receive the signal light beam propagated from the light-splitting module and to guide the signal light beam back to the light-splitting module. The second light-guiding module is configured to receive the reference light beam propagated from the light-splitting module and to guide the reference light beam back to the light-splitting module
Data Source
AI summary
A holographic light-emitting module includes a light source module and a light shape control module. The light source module is configured to provide a signal light beam and a reference light beam, in which polarizations of the signal light beam and the reference light beam are orthogonal. The light shape control module is configured to receive the signal light beam and the reference light beam propagated from the light source module, in which the signal light beam and the reference light beam are modulated and emitted by the light shape control module The reference light beam is surrounded by the signal light beam and located at a center of the signal light beam, and the signal light beam and the reference light beam are partially overlapped.