Hologram Recording Medium Composition for High-Temperature Grating Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hologram recording media used in high-temperature environments, such as mobile devices and vehicle parts, suffer from deformation of diffraction gratings, leading to distorted images and impaired functionality.
Innovation Solution
A hologram recording medium comprising a photopolymer layer formed by crosslinking a siloxane-based polymer with a silane-based polymer and acrylic-based polyol, incorporating a photoreactive monomer and fluorinated compound, which maintains stability and high diffraction efficiency even under high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photopolymer layer is used to record holograms, then high diffraction efficiency and refractive index modulation can be achieved, but the diffraction grating deforms under high temperature causing image distortion
Solution Approach 1:
The patent uses a composite photopolymer system combining siloxane-based polymer with acrylic-based polyol and photoreactive monomer. This composite material structure provides both high diffraction efficiency and thermal stability, resolving the contradiction between hologram recording performance and thermal resistance.
Solution Approach 2:
The patent modifies the photopolymer composition parameters by incorporating specific ratios of siloxane-based polymer (5-50 wt%), acrylic-based polyol (45-90 wt%), and photoreactive monomer (1-20 wt%). These parameter changes optimize both the refractive index modulation for hologram recording and the thermal stability to prevent grating deformation.
2Measurement precision
If the photopolymer layer thickness is decreased to increase angular selectivity, then angular selectivity improves, but diffraction efficiency decreases
Solution Approach 1:
The patent optimizes the photopolymer layer thickness parameter to achieve the desired angular selectivity while maintaining sufficient diffraction efficiency. The specific thickness range (5-50 μm) is determined to balance these competing requirements, allowing the system to achieve both precision in angular selection and reliability in diffraction performance.
Solution Approach 2:
The composite photopolymer composition enhances the refractive index modulation capability, allowing thinner layers to maintain adequate diffraction efficiency. The high refractive index contrast provided by the siloxane-acrylic composite system enables angular selectivity improvement without proportional loss in diffraction efficiency.
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 medium provides excellent optical recording characteristics and reliability under high temperatures, minimizing deformation of diffraction gratings and maintaining image integrity.
Implementation Method 1
a photopolymer composition for preparing a hologram includes a polymer matrix, a photoreactive monomer, and a photoinitiator system, and the photopolymer layer prepared from such a composition is irradiated with laser interference light to induce photopolymerization of local monomers
Implementation Method 2
A refractive index modulation is generated through this local photopolymerization process, and a diffraction grating is generated by such a refractive index modulation
Data Source
Figure 1
AI summary
The present disclosure relates to a hologram recording medium and an optical element comprising the same. The hologram recording medium not only has excellent optical recording properties but also can exhibit excellent reliability and high transparency even under high temperature conditions.