Transparent Substrate Laser Mirror for Heat Dissipation
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Solution Overview
Problem
High power lasers face inefficiencies due to heat accumulation in optical elements, which are difficult to cool effectively, especially in remote and dynamic scanning systems, leading to potential mirror damage and system degradation.
Innovation Solution
Designing low absorption mirrors with transparent substrates and specific coatings to minimize energy absorption, redirecting non-reflected energy into heat-dissipating structures where it can be removed by natural convection or conduction, eliminating the need for active cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional mirrors with high reflective coating are used in high power laser systems, then the mirror can reflect most of the laser beam, but the absorbed heat quickly raises the mirror temperature to destructive levels
Solution Approach 1:
The patent extracts the heat dissipation function from the mirror itself by making the mirror substrate transparent to the laser wavelength. The absorbed heat is taken out of the mirror structure and redirected to a separate heat sink located behind the mirror, preventing temperature buildup in the mirror while maintaining high reflection efficiency.
Solution Approach 2:
The patent introduces a transparent substrate as an intermediary between the reflective coating and the heat sink. This substrate allows the laser beam to pass through to the reflective coating while also serving as a thermal conduction path to transfer absorbed heat to the heat sink, decoupling the optical function from the thermal management function.
2Temperature
If active cooling systems are installed at the remote scanner location to cool the mirrors, then the mirror temperature can be controlled, but the system complexity and cost increase significantly
Solution Approach 1:
The patent enables the mirror system to self-regulate temperature passively through natural convection. The transparent substrate design allows heat to be conducted to the rear surface where it dissipates into the surrounding air through natural convection currents, eliminating the need for active cooling systems with pumps, valves, and control mechanisms.
Solution Approach 2:
The patent converts the previously harmful effect of heat absorption into a beneficial passive cooling mechanism. The heat absorbed by the mirror substrate is now intentionally directed to the rear surface where it drives natural convection currents, creating a self-sustaining heat dissipation system that requires no external power or control.
3Strength
If the mirror substrate is made thick to improve structural strength, then the mirror can support itself without active cooling, but the heat dissipation capability is reduced
Solution Approach 1:
The patent applies different quality requirements to different regions of the mirror substrate. The front surface maintains sufficient thickness for mechanical strength and structural support, while the bulk of the substrate is optimized for thermal conduction to the rear heat sink. The local thermal and mechanical properties are tailored to different functional requirements within the same component.
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 approach reduces mirror size and heat absorption, maintaining temperature within safe limits without active cooling, enhancing system performance and reducing costs by avoiding complex cooling systems.
Implementation Method 1
at least one highly reflective coating on a first side of the substrate
Implementation Method 2
at least one anti-reflective coating on a second side of the substrate
Implementation Method 3
a substrate that is substantially transparent to the first wavelength illumination
Implementation Method 4
redirecting non-reflected energy into heat-dissipating structures for natural convection
Data Source
AI summary
A high power laser processing system is disclosed that includes a laser source and at least one optical element. The laser source provides a high power laser illumination of a first wavelength. The optical element includes a substrate that is substantially transparent to the first wavelength illumination, at least one highly reflective coating on a first side of the substrate, and at least one anti-reflective coating on a second side of the substrate.