Chalcogenide Glass Infrared Transmission via Indium Gettering
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Solution Overview
Problem
Chalcogenide glasses used in infrared applications suffer from reduced transmission due to oxygen contamination, leading to absorption of light by germanium-oxygen or arsenic-oxygen bonds, which limits their performance in optical systems and increases production costs through complex distillation processes or the use of toxic materials.
Innovation Solution
Incorporating indium and/or cadmium into chalcogenide glasses, which preferentially form bonds with oxygen, thereby reducing oxide impurity absorption and enhancing infrared transmission in the 8-15 μm range, while maintaining cost-effectiveness and handling safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex distillation processes are used to improve infrared transmission, then transmission performance is improved, but production cost increases significantly
Solution Approach 1:
The patent extracts and removes oxygen impurities from the chalcogenide glass melt during the melting process using specific gettering techniques, thereby eliminating the root cause of infrared absorption without requiring complex post-processing distillation equipment
Solution Approach 2:
The patent introduces intermediary substances (gettering agents such as aluminum, magnesium, or their halides) that selectively bind with oxygen impurities in the melt, facilitating their removal and preventing oxide bond formation that would otherwise absorb infrared radiation
2Reliability
If exceptionally pure raw materials are used to reduce oxygen contamination, then infrared transmission is improved, but material cost increases and handling difficulty increases
Solution Approach 1:
The patent performs preliminary oxygen removal by incorporating gettering agents directly into the glass batch before melting, so that oxygen impurities are captured during the melting process itself rather than requiring pre-purification of raw materials
Solution Approach 2:
The glass composition itself contains built-in oxygen-gettering components that automatically bind with oxygen impurities during melting, making the system self-cleaning and eliminating the need for externally supplied ultra-pure materials
3Reliability
If soft hygroscopic crystalline materials are used to achieve sufficient transmission, then infrared transmission is improved, but fabrication method options are limited and safety concerns arise
Solution Approach 1:
The patent utilizes the phase transition from crystalline to amorphous structure by rapidly cooling the melt to form glass, which eliminates the hygroscopic and toxic properties associated with soft crystalline materials while maintaining high infrared transmission
Solution Approach 2:
The patent creates a composite glass system combining chalcogenide base materials with oxygen-gettering additives, achieving both high transmission and improved fabrication properties that enable diverse manufacturing techniques including fiber drawing and lens molding
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 addition of indium and cadmium significantly improves infrared transmission in chalcogenide glasses, extending their application range and reducing production costs by minimizing the need for complex processing and toxic materials, while ensuring stable glass composition and handling safety.
Implementation Method 1
Incorporating indium and/or cadmium into chalcogenide glasses, which preferentially form bonds with oxygen, thereby reducing oxide impurity absorption
Implementation Method 2
the absorption of light by germanium-oxygen (Ge—O) or arsenic-oxygen (As—O) bonds that form during the melting process
Data Source
AI summary
A glass composition and a method for producing the glass composition having an improved infrared transmission are provided. The composition includes indium and or cadmium; germanium; phosphorus, arsenic, and/or antimony; silver; lead; and sulfur, selenium, and/or tellurium. The method is performed by melting a mixture for a time period of between about 5 to about 48 hours and mixing the mixture at a temperature range that is between about 600-1000° C.