Optical Glass Composition for High Refractive Index and Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional high refractive index and low dispersion glasses face challenges in maintaining stability while enhancing refractive index, often leading to devitrification and reduced vitrification, limiting their application in optical systems.
Innovation Solution
The development of oxide glass compositions containing specific cation ratios of Si4+, B3+, La3+, Ti4+, Nb5+, and Zr4+, with optimized content ranges to achieve high refractive index and low dispersion while ensuring glass stability, as defined by specific refractive index and Abbé number ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the refractive index is enhanced while maintaining the Abbé number, then the optical performance is improved, but the glass stability is lowered leading to devitrification
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional ratios of multiple oxides (SiO2, B2O3, La2O3, TiO2, Nb2O5, ZrO2, and other components) within specific ranges. By adjusting these chemical parameters and their interrelationships, the invention achieves high refractive index (nd≥2.0) and low dispersion (Abbe number νd≤30) while maintaining glass stability and preventing devitrification.
Solution Approach 2:
The patent employs composite materials by creating a multi-component glass system that combines network formers (SiO2, B2O3), network modifiers (La2O3, TiO2, Nb2O5, ZrO2), and other oxides in specific proportions. This composite approach allows the glass to achieve superior optical properties (high refractive index and low dispersion) while maintaining structural stability through the synergistic effects of multiple components.
2Illumination intensity
If conventional glass compositions are used to achieve high refractive index, then the Abbé number decreases, but the glass becomes unstable and devitrifies
Solution Approach 1:
The patent resolves this contradiction by implementing a comprehensive parameter control strategy that defines specific compositional ranges for each oxide component. The invention specifies that SiO2 content should be 30-70%, B2O3 content 10-40%, La2O3 content 10-30%, TiO2 content 5-20%, Nb2O5 content 3-15%, and ZrO2 content 2-10%, among others. These parameter constraints ensure the glass achieves high refractive index while maintaining stability and preventing devitrification.
Solution Approach 2:
The patent incorporates feedback mechanisms through the interdependent relationships between compositional parameters. The specified ranges for each oxide component are designed to work in concert, where the presence and quantity of one component influences the optimal ranges of others. This feedback loop in composition design ensures that the glass system self-regulates to maintain stability while achieving the desired optical properties.
Data Source
AI summary
An optical glass that is oxide glass, containing Si4+, B3+, La3+, Ti4+, Nb5+, and Zr4+; containing, denoted as cation %, Si4+ and B3+ of 5 to 55% in total, La3+ of 10 to 50%, with a total content of La3+, Gd3+, Y3+ and Yb3+≦70%, and Ti4+, Nb5+, Ta5+ and W6+ of 22 to 55% in total, with a content of Ti4+≦22%, wherein [Si4+/(Si4++B3+)]≦0.40; the total content of La3+, Gd3+, Y3+, Yb3+, Zr4+, Ti4+, Nb5+, Ta5+, W6+ and Bi3+≧65%; [Y3+/(La3++Gd3++Y3++Yb3+)]≦0.12; [Ba2+/(La3++Gd3++Y3++Yb3+)]≦0.40; [(Zr4++Ti4++Nb5++Ta5++W6+)/Zr4+]≧2; (Ti4+/B3+)≧0.85; and an Abbé number νd is in a range from 23 to 35, and a refractive index nd satisfies nd≧2.205−(0.0062×νd).