Carbon Heat-Spreader Laser Optics for Debris and Thermal Damage
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Solution Overview
Problem
High-energy laser systems face damage from foreign object debris and thermal issues due to the lack of effective thermal management in non-conductive substrates, which are prone to damage and have poor long-term survivability in tactical environments.
Innovation Solution
A high-energy laser element is designed with a non-conductive substrate layer assembly, a reflector layer assembly, and a thermally conductive carbon layer, where the carbon layer acts as a heat spreader between the substrate and reflector layers, and includes thermal sensors for monitoring, utilizing diamond-like or diamond crystal growth for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If non-conductive substrates (e.g., fused silica) are used, then surface quality is improved, but damage resistance to foreign object debris deteriorates
Solution Approach 1:
The patent employs a composite structure combining non-conductive substrate materials (fused silica) with thermally conductive coating layers (diamond-like carbon, amorphous carbon). This composite approach allows the substrate to maintain its excellent surface quality while the coating provides enhanced damage resistance and thermal management capabilities, resolving the contradiction between surface quality and damage resistance
Solution Approach 2:
The patent applies thermally conductive carbon coatings selectively on specific surfaces or regions of the non-conductive substrate. This local quality approach ensures that areas requiring high damage resistance and thermal management receive the conductive coating, while other areas maintain the inherent surface quality of the non-conductive material
2Reliability
If thermally conductive substrates (e.g., single-crystal silicon) are used, then damage resistance is improved, but surface quality deteriorates
Solution Approach 1:
The patent combines thermally conductive substrate materials (single-crystal silicon) with non-conductive optical coating layers. This composite structure allows the substrate to provide excellent damage resistance and thermal conductivity while the optical coatings restore the required surface quality and optical performance
Solution Approach 2:
The patent applies optical coating layers on specific surfaces of thermally conductive substrates to restore surface quality where needed, while leaving other areas with inherent damage resistance
3Reliability
If fluence is decreased to reduce particulate damage risks, then damage resistance is improved, but laser power deteriorates
Solution Approach 1:
The patent introduces thermally conductive carbon layers as intermediary elements between the optical substrate and foreign object debris. These layers act as heat sinks that rapidly conduct away thermal energy from impact sites, preventing the temperature rise that leads to particulate damage, thereby maintaining high fluence operation without increasing damage risk
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 thermally conductive carbon layer effectively reduces substrate damage by spreading heat and maintaining surface quality, while thermal sensors monitor temperature, significantly improving the laser's resistance to foreign object debris and thermal stress.
Implementation Method 1
a thermally conductive carbon layer, where the carbon layer acts as a heat spreader between the substrate and reflector layers
Implementation Method 2
the thermally conductive carbon layer includes at least one of a diamond-like carbon crystal growth layer and/or a diamond crystal growth layer
Data Source
AI summary
A high-energy laser (HEL) element is provided and includes a non-conductive substrate layer assembly, a reflector layer assembly and a thermally conductive carbon layer. The thermally conductive carbon layer is at least partially interposed between the non-conductive substrate layer assembly and the reflector layer assembly.