Two-Dimensional Motion for Uniform Long-Seed DKDP Crystal Growth
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Solution Overview
Problem
Existing methods for growing DKDP crystals, such as the rotating crystal method, suffer from non-uniform hydrodynamics leading to macro-defects and poor optical quality, especially in large-size crystals, due to the presence of flow regions and varying shear stress across the crystal surface.
Innovation Solution
A method employing two-dimensional motion of the crystal carrying frame in a growth tank, with periodic square translations, ensuring uniform solute supply and avoiding flow regions, thereby eliminating the cylinder-cone interface and improving growth velocity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the rotating crystal method is used to grow DKDP crystals, then the crystal growth can be performed with relatively simple equipment, but non-uniform hydrodynamics lead to macro-defects and poor optical quality
Solution Approach 1:
The patent transitions from one-dimensional rotational motion to two-dimensional periodic translational motion in the horizontal plane. The crystal carrying frame moves along a predetermined periodic trajectory that includes both forward and backward translation components, eliminating the flow regions (incident flow, side flow, and wake flow) that cause non-uniform hydrodynamics in rotational methods. This dimensional change in motion pattern resolves the contradiction by achieving uniform solute transport without requiring complex equipment.
2Productivity
If the point seed crystal omni-directional rapid growth method is used, then the growth velocity increases, but the cylinder-cone interface forms causing poor crystal quality
Solution Approach 1:
The patent employs dynamic periodic translation motion of the crystal carrying frame instead of static rotational motion. The motion parameters (amplitude, frequency, trajectory) are optimized to maintain uniform supersaturation distribution throughout the growth solution. This dynamic approach allows the crystal to grow uniformly in all directions from the long seed crystal without forming cylinder-cone interfaces, achieving both rapid growth velocity and high crystal quality.
3Manufacturing precision
If the traditional slow growth method is used, then the crystal quality is maintained, but the growth velocity is slow and the growth period is long
Solution Approach 1:
The patent changes the motion parameter from rotational speed to periodic translation amplitude and frequency. By optimizing these parameters, the system achieves uniform solute transport that maintains high crystal quality while enabling rapid growth. The periodic translation motion creates favorable hydrodynamic conditions that increase the mass transfer rate compared to traditional slow growth methods, thereby improving productivity without sacrificing manufacturing precision.
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 method achieves high-quality, rapid growth of large-size DKDP crystals by ensuring uniform solute transport and eliminating flow regions, resulting in improved crystal quality and stability.
Implementation Method 1
driving the crystal carrying frame to periodically translating on a horizontal plane according to a square motion track in a growth solution in the growth tank by the two-dimensional motion motor
Implementation Method 2
The non-uniformity of hydrodynamics on the crystal surface will lead to the non-uniformity of microscopic solute transport in the crystal growth
Implementation Method 3
a method for growing long-seed DKDP crystal by two-dimensional motion
Data Source
AI summary
A method for growing long-seed DKDP crystal by two-dimensional motion grows the crystal along the cylindrical surface, and there is no cylinder-cone interface with low optical quality, while avoiding three flow regions which are inevitable in the crystal growth process by rotating crystal method, including incident flow, side flow and wake flow, and easily cause inclusion formation. The long seed crystal moves periodically in the fresh solution, four cylindrical surfaces can achieve reversible shear flow in one cycle, and any point on the cylindrical surface experiences the same hydrodynamic conditions in one movement cycle, so that the solute supply is sufficient and uniform, the growth velocity is improved, and the stability of morphology is ensured. The method facilitates rapid growth of high quality DKDP crystals and provides a better solution for the large-size, high-quality DKDP crystal growth required by the ICF laser device.