Waveguide Cell Holographic Grating Recording for High Throughput
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Solution Overview
Problem
Existing methods for recording holographic gratings in waveguide cells are inefficient and lack the capability for high-throughput production, particularly in applications requiring multiple optical functions like Augmented Reality (AR) and Virtual Reality (VR) displays and sensors.
Innovation Solution
A holographic recording system utilizing a movable platform and multiple laser sources or beamsplitters to simultaneously record multiple volume gratings in waveguide cells, allowing for high-throughput production by directing recording beams to multiple stations sequentially or simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional single-station recording methods are used, then device complexity is low, but productivity is insufficient for high-throughput production
Solution Approach 1:
The system divides the recording process into multiple independent stations (first station, second station, etc.), each capable of receiving recording beams and processing waveguide cells separately. This segmentation allows parallel processing of multiple waveguide cells simultaneously, thereby increasing overall productivity while maintaining manageable complexity at each individual station.
Solution Approach 2:
The recording system is designed with universal components that can serve multiple functions across different stations. The laser source and beam control mechanisms can be configured to serve multiple stations sequentially or simultaneously, allowing the same hardware to perform multiple recording operations without requiring entirely separate systems for each station.
2Loss of time
If multiple waveguide cells are processed sequentially, then device complexity is low, but loss of time increases due to sequential processing
Solution Approach 1:
The system enables continuous processing by having multiple stations operating simultaneously or in rapid succession. While one station is processing a waveguide cell, another station can be preparing or finishing a different cell, eliminating idle time and ensuring continuous productive action throughout the system.
Solution Approach 2:
The system incorporates movable platforms and adjustable beam directing mechanisms that can dynamically reconfigure between different stations and waveguide cells. This dynamic capability allows the system to adapt its configuration for optimal throughput, switching between sequential and parallel operation modes as needed.
3Manufacturing precision
If simple beam directing is used, then device complexity is low, but manufacturing precision is insufficient for multiple optical functions
Solution Approach 1:
The system introduces intermediary components such as beam splitters, mirrors, and directors that mediate between the laser source and the waveguide cells. These intermediaries enable precise control of beam direction and distribution to multiple stations with high manufacturing precision, while the modular nature of these components keeps the overall system complexity manageable.
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
Enables efficient and high-throughput recording of holographic gratings in waveguide cells, enhancing performance in AR/VR displays and sensors by improving production speed and optical functionality.
Implementation Method 1
During the recording process, the monomers polymerize and the mixture undergoes a photopolymerization-induced phase separation
Implementation Method 2
Holographic optical elements, such as volume phase gratings, can be recorded in such a liquid mixture by illuminating the material with two mutually coherent laser beams
Implementation Method 3
planar waveguides can be designed to utilize diffraction gratings to diffract and couple incident light into the waveguide structure such that the in-coupled light can proceed to travel within the planar structure via total internal reflection
Implementation Method 4
planar waveguides can be designed to utilize diffraction gratings to diffract and couple incident light into the waveguide structure
Data Source
AI summary
Holographic volume gratings in waveguide cells can be recorded using many different methods and systems in accordance with various embodiments of the invention. One embodiment includes a holographic recording system including at least one laser source configured to emit recording beams and a movable platform configured to move between a first position and a second position, wherein when the movable platform is in the first position, the at least one laser source is configured to emit a first set of one or more recording beams toward a first set of one or more stations and when the movable platform is in the second position, the at least one laser source is configured to emit a second set of one or more recording beams toward a second set of one or more stations.