Crystal Quartz Polarity Inversion for Flat QPM Elements
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Solution Overview
Problem
The existing methods for manufacturing crystal quartz elements with a periodic inversion structure for quasi-phase matching (QPM) face challenges in mass productivity due to the need for complex surface processing.
Innovation Solution
A crystal quartz element with a plane main face featuring multiple polarity inverted regions spaced apart by non-inverted regions, allowing for the formation of polarity inverted regions without surface stepping, using a pressing jig with projections to create these regions efficiently, thereby improving productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stepped structure is formed on the crystal quartz surface to create polarity inverted regions, then the QPM function is achieved, but the manufacturing complexity increases and mass productivity decreases
Solution Approach 1:
Instead of forming a stepped structure on the crystal surface and then inverting polarity in the steps, the invention inverts the polarity in the entire crystal substrate first, and then forms a flat periodic structure on the surface. This reverses the conventional sequence of operations, allowing the use of simple flat surface processing techniques rather than complex stepped structure fabrication, thereby improving mass productivity while maintaining the QPM function.
Solution Approach 2:
The invention replaces the mechanical stepped structure formation process with a chemical or field-based polarity inversion process applied to a flat substrate. By using electric field application or other non-mechanical methods to create the periodic polarity structure, the complex mechanical machining of stepped surfaces is avoided, enabling more efficient mass production.
2Manufacturing precision
If surface processing is performed to form stepped structures, then polarity inverted regions are created, but the manufacturing process becomes complex and time-consuming
Solution Approach 1:
The polarity inversion is performed as a preliminary step before surface structure formation. By pre-inverting the polarity in the entire crystal substrate using electric fields or other efficient methods, the subsequent surface processing only needs to create simple periodic modulations rather than complex stepped structures, significantly reducing the time required for manufacturing while maintaining precision.
3Power
If high-intensity laser light is used for wavelength conversion, then the optical oscillation device achieves high power output, but the optical element may be damaged
Solution Approach 1:
The invention changes the material parameter from lithium niobate to crystal quartz, which has fundamentally different damage threshold characteristics. Crystal quartz can withstand much higher laser intensities without damage, allowing the optical oscillation device to operate at high power levels while maintaining reliability. This material substitution enables high power output without compromising the durability of the optical element.
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 enhances mass productivity and ensures effective phase-matching of light within the crystal quartz element, preventing damage from high-intensity laser light, and allows for the reuse of the pressing jig, maintaining its integrity.
Implementation Method 1
forming a plurality of polarity inverted regions corresponding to a plurality of first projections in a crystal quartz body by heating and pressing the first main face by the first pressing face
Implementation Method 2
light transmitted through the inside of the crystal quartz element is well phase-matched in the plurality of polarity inverted regions
Data Source
AI summary
A crystal quartz element includes a main face provided with a plurality of polarity inverted regions and a polarity non-inverted region, the plurality of polarity inverted regions are spaced apart from each other via the polarity non-inverted region, and the main face is a plane face. A method for manufacturing a crystal quartz element includes: preparing a crystal quartz body including a first main face which is a plane face, and a first pressing jig including a first pressing face on which a plurality of first projections are provided; and forming a plurality of polarity inverted regions corresponding to the plurality of first projections in the crystal quartz body by heating and pressing the first main face by the first pressing face.