Diffusion-Bonded Laser Joined Body for Low-Fresnel Cooling
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Solution Overview
Problem
The combination of materials with different refractive indices in laser oscillators leads to significant Fresnel reflection losses, degrading the quality of laser light due to the temperature gradient and thermal aberrations in optical materials.
Innovation Solution
A joined body is formed by diffusively joining materials capable of transmitting light, such as YAG and sapphire, using pulsed electric current sintering (PECS) to create a strong bond without adhesives, ensuring minimal interference fringes and efficient heat dissipation, thereby reducing thermal aberrations and maintaining optical quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If materials with different refractive indices are bonded together to improve heat dissipation, then thermal conductivity is improved, but Fresnel reflection losses increase
Solution Approach 1:
An intermediate layer with refractive index gradient is introduced between the first and second materials. This intermediate layer acts as a mediator that gradually transitions the refractive index from the first material to the second material, thereby reducing Fresnel reflection losses while maintaining effective heat dissipation pathways.
Solution Approach 2:
The refractive index parameter is changed gradually across the intermediate layer rather than having a sharp discontinuity. This parameter change strategy reduces the optical impedance mismatch between materials with different refractive indices, minimizing reflection losses while preserving the thermal conductivity benefits of the bonded structure.
2Illumination intensity
If materials with different refractive indices are bonded together to enable light transmission through composite structure, then optical functionality is improved, but interference fringes are generated
Solution Approach 1:
The intermediate layer with refractive index gradient serves as an optical mediator that eliminates abrupt refractive index changes at the interface. This gradual transition prevents the generation of interference fringes while maintaining light transmission functionality across the bonded interface.
Solution Approach 2:
The intermediate layer introduces a spatially varying refractive index profile localized at the interface region. This local quality change allows the bulk materials to maintain their individual optical properties for light transmission while the interface region specifically addresses the interference fringe problem through gradual refractive index transition.
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 solution effectively suppresses Fresnel losses and enhances the optical quality of laser light by ensuring a stable temperature gradient, allowing for higher output power and efficient heat dissipation in laser oscillators and amplifiers.
Implementation Method 1
an atom contained in the first material diffusively enters the second material in such a degree that an interference fringe is not generated in the joined body
Implementation Method 2
a step of heating the first material and the second material to a predetermined temperature by supplying pulse current to the pressurized first material and the pressurized second material
Implementation Method 3
at a joining interface between the first material and the second material, the joined body is capable of transmitting light
Data Source
AI summary
A joined body (10) includes an optical material (11) and a cooling material (12) that are capable of transmitting light and are joined together. At a joining interface between the optical material (11) and the cooling material (12), the joined body (10) is capable of transmitting light, and also an atom contained in the optical material (11) diffusively enters the cooling material (12) in such a degree that an interference fringe is not generated in the joined body (10). A diffusive entry length of an atom contained in the optical material (11) into the cooling material (12) may be in a range from approximately 1.0 nm to approximately 10 μm.