Polarizing Glass with Copper Particles for Optical Isolators
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Solution Overview
Problem
Conventional polarizing glasses used in optical isolators face challenges in miniaturization while maintaining extinction ratio and environmental resistance, and they suffer from surface deterioration in long-term high-temperature, high-humidity conditions, leading to potential cracks and degradation of polarization characteristics.
Innovation Solution
A polarizing glass with geometrically anisotropic metallic copper particles dispersed in a borosilicate glass base body, excluding alkali earth metal oxides and PbO, and containing specific additive components like Y2O3, ZrO2, and SnO, which enhances weatherability and allows elongation at higher tension without breakage, resulting in a high-performance optical isolator with improved reliability and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polarizing glass is used in optical isolators, then the extinction ratio can be maintained, but the surface deteriorates in long-term high-temperature high-humidity conditions leading to cracks and reliability issues
Solution Approach 1:
The patent changes the chemical composition parameters of the glass base body by excluding alkali earth metal oxides and PbO, and incorporating specific additives (Y2O3, ZrO2, La2O3, CeO2, Ce2O3, TiO2, V2O5, Ta2O5, WO3, Nb2O5) in controlled amounts. This compositional parameter change enhances the glass's chemical stability and resistance to surface deterioration in high-temperature high-humidity environments, thereby improving long-term reliability without sacrificing extinction ratio performance
Solution Approach 2:
The patent creates a composite glass system by combining borosilicate glass base body with multiple oxide additives that work synergistically. The combination of Y2O3, ZrO2, and other rare earth and transition metal oxides forms a composite material structure that provides both the required optical properties for polarization and enhanced weatherability, preventing surface deterioration while maintaining reliability
2Ease of manufacture
If the glass base body contains alkali earth metal oxides and PbO, then manufacturing is easier, but weatherability deteriorates in long-term high-temperature high-humidity conditions
Solution Approach 1:
The patent modifies the glass composition parameters by removing alkali earth metal oxides and PbO that facilitate manufacturing but compromise weatherability. Instead, it uses alternative oxides (Y2O3, ZrO2, etc.) that maintain glass processability while providing superior resistance to high-temperature high-humidity degradation, thus resolving the contradiction between ease of manufacture and weatherability
Solution Approach 2:
The patent replaces traditional glass components (alkali earth metal oxides and PbO) that are easier to manufacture but have short service life in harsh environments with alternative materials that, while potentially requiring more careful processing, provide extended service life and maintained performance in long-term high-temperature high-humidity conditions
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 solution provides a polarizing glass with enhanced weatherability and long-term reliability, enabling high-performance optical isolators with improved extinction ratio and low insertion loss, while maintaining cost-effectiveness and preventing surface deterioration.
Implementation Method 1
Polarizing glasses in which metal microparticles having large aspect ratios are aligned are know as the polarizer... the geometrically anisotropic metal particles are metallic copper particles
Implementation Method 2
The polarizing glass described in Patent Reference 1 is produced by elongating copper halide particles at a temperature within a range at which the glass exhibits a viscosity of 107 to 1010 Pa·S
Implementation Method 3
employing a heat treatment in a reducing atmosphere to reduce the copper halide particles to obtain a polarizing glass containing elongated geometrically anisotropic metallic copper particles
Data Source
AI summary
To Provide a polarizing glass with better weatherability than conventional polarizing glasses, affording high long-term reliability without the above-described surface deterioration. To provide an optical isolator employing polarizing glass of improved weatherability, affording good weatherability and high reliability for extended periods.A polarizing glass comprising geometrically anisotropic particles dispersed in an oriented manner in at least one surface layer of a glass base body. The glass base body does not comprise an oxide of alkali earth metal and PbO, and consists of borosilicate glass comprising at least one additive component selected from the group consisting of Y2O3, ZrO2, La2O3, Ce O2, Ce2O3, Ti O2, V2O5, Ta2O5, WO3, and Nb2O5, and the geometrically anisotropic metal particles are metallic cupper particles. An optical isolator employing the polarizing glass.