Barium Cesium Borate Crystal Growth via Flux Method
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Solution Overview
Problem
Current nonlinear optical crystals for ultraviolet and deep-ultraviolet laser systems face challenges such as easy deliquescence, long growth cycles, severe layered growth habits, and high costs, limiting the availability of large-size, high-quality crystals with good optical and mechanical properties.
Innovation Solution
A nonlinear optical crystal of barium cesium borate (Cs3Ba3B11O20) is developed using a flux method, allowing for the growth of large, low-cost, and high-quality crystals with a wide light transmission band and stable physical and chemical properties, suitable for ultraviolet and deep-ultraviolet laser applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional nonlinear optical crystals (BBO, LBO, CBO, etc.) are used for ultraviolet and deep-ultraviolet frequency conversion, then optical performance is achieved, but the crystals deliquesce easily and have long growth cycles
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific molar ratio range of Cs2O (0.4-0.6) and BaO (0.3-0.7) to create a new crystal phase with improved stability. This compositional parameter optimization resolves the contradiction by achieving both deliquescence resistance and reasonable growth cycle through the balanced chemical formula Cs2O·xBaO·yB2O3
Solution Approach 2:
The patent creates a composite oxide material system combining Cs2O, BaO, and B2O3 in specific proportions. This composite approach integrates the advantages of individual oxides to produce a crystal that resists deliquescence while maintaining acceptable growth characteristics, directly addressing the technical contradiction
2Shape
If conventional nonlinear optical crystals are used, then optical performance is achieved, but the layered growth habit is severe and price is high
Solution Approach 1:
The patent optimizes temperature parameters during crystal growth, specifying a growth temperature range of 600-700°C, to control the crystallization process and minimize layered growth habits. This temperature parameter control, combined with the specific chemical composition, reduces manufacturing complexity and cost while improving crystal quality
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 enables the production of large-size, centimeter-scale nonlinear optical crystals with improved mechanical properties and ease of processing, suitable for manufacturing devices like frequency converters and optical parametric oscillators, addressing the limitations of existing crystals.
Implementation Method 1
The crystal is grown by a flux method
Implementation Method 2
adding the compound cesium barium borate obtained in step a to a flux... heating up the mixture to a temperature of 700-750° C. and holding at the temperature for 10-100 h before cooling down to 680-618° C. to obtain a mixed melt
Data Source
AI summary
A nonlinear optical crystal of barium cesium borate, a preparation method and use thereof are provided. The nonlinear optical crystal has a chemical formula of CsBa3B11O20 and a molecular weight of 983.84. The nonlinear optical crystal belongs to an orthorhombic crystal system; a space group of the nonlinear optical crystal is Cmc21; lattice parameters of the nonlinear optical crystal are a=19.011(7) Å, b=10.837(4) Å, c=8.578(3) Å, Z=4, V=1767.4(11) Å3; and a Mohs hardness of the nonlinear optical crystal is 4-5. The nonlinear optical crystal is grown by a flux method. The nonlinear optical crystal of the barium cesium borate obtained is used for a manufacture of non-linear optical devices. The nonlinear optical crystal has a large size of centimeter-scale at least and is prepared by fast, simple and low-cost operations. The nonlinear optical crystal prepared has a large size, a wide light transmission band and good mechanical properties.