Glass-Ceramic Optical Element for Broad Spectral Transmission
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Solution Overview
Problem
Current optical elements, particularly optical fibers, have limited spectral range due to low SiO2 content and poor solubility of rare earth ions in silica, restricting their ability to transmit or generate optical radiation at long wavelengths with sufficient intensity.
Innovation Solution
An optical element with a matrix comprising at least 75% SiO2 and nanoscale particles of specific oxides, doped with transition metals or rare earth elements, manufactured using a precursor powder with controlled SiO2, Na2O, and Ga2O3 composition, and processed through high-temperature heating and annealing to enhance transparency and luminescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica is used as the base material for optical elements, then transparency is achieved, but the spectral range is limited and rare earth ion solubility is poor
Solution Approach 1:
The patent uses glass-ceramic composite materials combining an amorphous glass matrix with crystalline phases (such as zinc gallate, zinc germanate, or bismuth germanate crystals). This composite structure provides both the transparency of glass and the enhanced spectral properties and ion solubility of crystals, resolving the contradiction between transparency and spectral range adaptability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the base material by incorporating metal oxides (ZnO, GeO2, Bi2O3) in specific ratios alongside SiO2. By adjusting these compositional parameters, the material achieves improved rare earth ion solubility and broader spectral transmission while maintaining optical transparency.
2Adaptability or versatility
If glass-ceramic materials are used to expand spectral range, then wavelength accessibility improves, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates nucleating agents and specific oxide compositions into the glass matrix before fabrication. These preliminary compositional preparations enable controlled crystal formation during subsequent heat treatment, simplifying the manufacturing process by pre-configuring the material for predictable phase separation and crystallization.
Solution Approach 2:
The patent utilizes controlled phase transitions during manufacturing, where the glass-ceramic material undergoes demixing at the nanoscale followed by crystallization through heat treatment. This phase transition approach allows systematic control of the microstructure and optical properties while following a standardized manufacturing protocol.
3Illumination intensity
If rare earth ions are doped in silica, then luminescence is achieved, but emission efficiency is limited due to poor solubility
Solution Approach 1:
The glass-ceramic composite structure provides crystal phases with high affinity for rare earth ions, dramatically increasing ion solubility compared to pure silica. The crystalline environments (such as zinc gallate or bismuth germanate phases) offer suitable coordination sites that enhance both ion incorporation and luminescence efficiency.
Solution Approach 2:
The patent creates crystal phases that replicate the favorable coordination environments found in known luminescent materials, allowing rare earth ions to occupy structurally similar sites that promote efficient luminescence. This copying of optimal ion-host interactions from reference materials enhances emission efficiency.
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 enables the production of optical elements capable of transmitting broadband optical radiation over a wider spectral range, reducing propagation losses and increasing luminescence intensity, thereby overcoming the limitations of existing materials.
Implementation Method 1
Optical elements made of glass-ceramic materials... make it possible in particular to consider using dopants which are not luminescent in silica
Implementation Method 2
The wavelength of the obtained optical radiation then depends on the type of dopants used... rare earth ions are poorly soluble in silica, which limits the emission efficiency
Implementation Method 3
These glass-ceramic materials are obtained via the synthesis of glasses that are demixed (phase separation) at the nanoscale which are then crystallized (by a heat treatment)
Implementation Method 4
the synthesis of glasses that are demixed (phase separation) at the nanoscale
Data Source
AI summary
An optical element is provided. The optical element may comprise a material, the material being a matrix and a set of particles included in the matrix, the material having a molar fraction of SiO2 higher than or equal to 65 percent, each particle having a dimension smaller than or equal to 80 nanometers.