Alkali Metal Monohydrogen Cyanurate Crystals for UV Conversion
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Solution Overview
Problem
Current nonlinear optical crystals face limitations in ultraviolet and deep ultraviolet applications due to issues such as large birefringence, poor structural integrity, and difficulty in growing large, uniform crystals, which affect harmonic conversion efficiency and phase matching range.
Innovation Solution
Development of alkali metal monohydrogen cyanurate compounds, specifically potassium lithium monohydrogen cyanurate dihydrate (KLHCY), rubidium lithium monohydrogen cyanurate dihydrate (RLHCY), and rubidium sodium monohydrogen cyanurate dihydrate (RNHCY), with orthorhombic crystal structure and optimized synthesis methods, enabling efficient frequency conversion and transparency in the ultraviolet region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If borate-based nonlinear optical crystals with large conjugated π bonds are used, then ultraviolet absorption edge is reduced, but birefringence increases and harmonic conversion efficiency decreases
Solution Approach 1:
The patent changes the chemical composition parameters by replacing borate groups with cyanurate groups and adjusting cation ratios (e.g., x:y ratios in MxNy(HC3N3O3)·nH2O), achieving shorter UV absorption edges while controlling birefringence through compositional optimization
Solution Approach 2:
The patent creates composite crystal structures by combining different alkali metal cations (e.g., KRb, K2Na, Rb2Na) with cyanurate anions, forming composite materials that balance UV transparency and nonlinear optical properties through synergistic effects of different cations
2Object-affected harmful factors
If layered crystal structures are used, then ultraviolet absorption edge is reduced, but crystal growth becomes difficult due to electrostatic attraction between layers
Solution Approach 1:
The patent changes the bonding parameters by replacing electrostatic attractions with covalent oxygen bridges between layers, fundamentally altering the interlayer bonding mechanism to enable easier crystal growth while maintaining UV transparency
Solution Approach 2:
The patent applies different bonding types at different locations: covalent bonds within layers and oxygen bridge connections between layers, creating local structural optimizations that collectively solve both UV transparency and growth difficulty
3Stability of the object's composition
If fluoride ions are replaced with oxygen to improve layered habit, then structural integrity improves, but absorption edge is red shifted
Solution Approach 1:
The patent changes the chemical composition by using cyanurate groups instead of borate or fluoride groups, and by optimizing the cation-to-anion ratio parameters, achieving both structural integrity and short UV absorption edges simultaneously
4Power
If (B3O7)5− groups form helical chains, then frequency doubling coefficient is large, but birefringence is too low and phase matching range is limited
Solution Approach 1:
The patent changes the structural parameters by adopting planar cyanurate group arrangements instead of helical chains, and optimizes the crystal system (monoclinic, triclinic, or orthorhombic) to achieve balanced birefringence and frequency doubling coefficients
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 alkali metal monohydrogen cyanurate crystals exhibit enhanced phase matching capability, achieving double to sextuple frequency conversion and maintaining transparency, with ultraviolet absorption edges shorter than 250 nm, suitable for optical devices requiring high harmonic output.
Implementation Method 1
Nonlinear optical effect of crystals refers to such an effect: when a laser beam with a certain polarization direction passes through a nonlinear optical crystal, the frequency of the beam will change
Implementation Method 2
the ultraviolet absorption edge thereof is shorter than 250 nm
Data Source
AI summary
An alkali metal monohydrogen cyanurate compound of the chemical formula AM(HC3N3O3)·nH2O (specifically such as KLi(HC3N3O3)·2H2O, RbLi(HC3N3O3)·2H2O, RbNa(HC3N3O3)·2H2O) and a nonlinear optical crystal thereof are related to optoelectronic functional materials. Measured using a powder frequency doubling test method, and the powder frequency doubling effect of the nonlinear optical crystal is about 2-3 times that of KH2PO4 (KDP). The ultraviolet absorption edge of the nonlinear optical crystal is shorter than 250 nm. The nonlinear optical crystal can achieve the harmonic generator of double, triple, or quadruple frequency for Nd: YAG (λ=1.064 μm). Moreover, the nonlinear optical crystal is of a single crystalline structure, is colorless and transparent, and does not deliquesce in air.