Wavelength Conversion Device With Segmented Crystal Layers
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Solution Overview
Problem
The existing methods for manufacturing wavelength conversion devices using crystals are difficult to stabilize due to the need for high loads and heat, making them challenging to produce effectively.
Innovation Solution
A wavelength conversion device is fabricated by alternating crystal layers with different thicknesses and orientations, bonded with adhesive layers in the gaps between thinner portions, allowing for easier manufacturing without applying stress to the crystals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heavy load and high heat are applied to artificially form a twinned structure in a crystal, then a polarization-inverted structure is obtained, but the manufacturing process becomes difficult to stabilize
Solution Approach 1:
The crystal structure is divided into multiple crystal layers with different thicknesses and orientations, bonded together with adhesive layers. This segmentation allows each layer to be manufactured separately under controlled conditions without requiring heavy loads and high heat, thereby stabilizing the manufacturing process while achieving the desired polarization-inverted structure
Solution Approach 2:
An adhesive layer is introduced as an intermediary between adjacent crystal layers. This adhesive layer facilitates bonding without requiring the application of heavy loads and high heat directly to the crystal, enabling stable manufacturing of the polarization-inverted structure
2Reliability
If a wavelength conversion device is made with crystal layers having alternately inverted crystal-axis orientations, then optical characteristics are improved, but the manufacturing complexity increases
Solution Approach 1:
The device is segmented into multiple crystal layers with alternating orientations, where each layer can be manufactured independently. This segmentation simplifies the overall manufacturing process by breaking down the complex task of creating a polarization-inverted structure into manageable steps, reducing manufacturing complexity while maintaining optical performance
Solution Approach 2:
Adhesive layers serve as intermediaries between crystal layers with different orientations, simplifying the assembly process. The adhesive layers make it easier to bond layers with alternately inverted crystal-axis orientations without requiring complex alignment and bonding procedures, thereby reducing device complexity
3Ease of manufacture
If adhesive layers are placed in gaps between adjacent second-thickness portions of crystal layers, then manufacturing is simplified, but transmission loss may increase
Solution Approach 1:
Adhesive layers are placed only in specific locations (gaps between adjacent second-thickness portions) rather than uniformly across all crystal layer interfaces. This localized placement simplifies manufacturing by reducing the amount of adhesive application and alignment required, while minimizing the impact on optical transmission by avoiding adhesive placement in critical optical paths
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 method simplifies the production of wavelength conversion devices with alternately inverted crystal-axis orientations, reducing transmission losses and enhancing the stability and durability of the device.
Implementation Method 1
an adhesive layer in at least part of a gap between adjacent second-thickness portions of the plurality of crystal layers and with which the plurality of crystal layers are bonded to one another
Implementation Method 2
light at a long wavelength is generated by a solid-state laser and is converted into light at a short wavelength by a wavelength conversion device
Data Source
AI summary
A wavelength conversion device that includes a plurality of crystal layers adjacent to one another such that crystal-axis orientations thereof are alternately arranged, the plurality of crystal layers each including a first-thickness portion having a first thickness and a second-thickness portion having a second thickness smaller than the first thickness; and an adhesive layer in at least part of a gap between adjacent second-thickness portions of the plurality of crystal layers and with which the plurality of crystal layers are bonded to one another.