Diffractive Optics Element Heat Dissipation via Siloxane Layer
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Solution Overview
Problem
Diffractive optics elements with thermosetting resin hologram layers suffer from low heat resistance, leading to thermal deformation and discoloration when exposed to high-output laser beams, necessitating both high transmissibility and heat resistance to maintain performance.
Innovation Solution
A diffractive optics element with a transparent inorganic substrate and a siloxane-bonded diffractive optics portion, where the base material is less than 20 μm thick and in contact with the substrate, allowing for efficient heat dissipation through the substrate's high thermal conductivity, and optionally using a silane coupling agent for strong adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermosetting resin is used as the hologram layer, then the diffractive optics element can be manufactured with good adhesion and optical properties, but the resin has low heat resistance and suffers thermal deformation and discoloration when exposed to high-output laser beams
Solution Approach 1:
The patent changes the material composition parameters by using a siloxane-based material instead of conventional thermosetting resin. This material substitution provides high heat resistance and maintains compositional stability under laser irradiation, eliminating thermal deformation and discoloration while preserving optical properties and adhesion.
Solution Approach 2:
The patent employs a composite structure consisting of a siloxane-based diffractive optics layer combined with specific adhesion promoters and curing agents. This composite material system achieves both excellent adhesion to the substrate and superior heat resistance, resolving the contradiction between manufacturing quality and thermal stability.
2Temperature
If the diffractive optics portion is made thinner to reduce heat absorption, then heat dissipation is improved, but the structural integrity and optical performance may be compromised
Solution Approach 1:
The patent optimizes the thickness parameter of the siloxane-based diffractive optics portion to a specific range that balances heat dissipation efficiency with structural integrity. The siloxane material's inherent high strength-to-thickness ratio allows for thin designs that effectively conduct heat to the substrate while maintaining sufficient mechanical strength and optical performance.
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 minimizes temperature rise and enhances the reliability and lifespan of the diffractive optics element, enabling it to withstand high-output laser beams while maintaining performance over a longer period.
Implementation Method 1
there is a sufficiently short heat path from the diffractive optics portion to the transparent substrate, which is configured of an inorganic material having a higher thermal conductivity, and thus heat produced by the diffractive optics portion can be dissipated
Implementation Method 2
the base material... can suppress the emission of heat caused by the diffractive optics portion absorbing the laser beam
Data Source
AI summary
A diffractive optics element includes a substrate configured of a sapphire substrate and a diffractive optics structure, provided on the substrate, that forms an image when a laser beam is incident thereon. The diffractive optics structure has a diffractive optics portion, and the diffractive optics portion has a base material and a diffractive optics layer disposed on the base material. The thickness of the base material is no greater than 20 μm.