Flame Hydrolysis Rod Lens Production
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Solution Overview
Problem
The existing methods for producing rod lenses with large edge lengths, such as those over 800 mm, are time-consuming, costly, and challenging due to the need for precise control of inhomogeneities and high temperatures, which can lead to material property changes and material losses, especially when producing long rod lenses with high optical homogeneity and low fluorescence under intense laser radiation.
Innovation Solution
A flame hydrolysis method is used to directly deposit SiOx particles onto a rotating stamp, creating a fused silica ingot for the rod lens base body, ensuring homogeneity and high OH content, with a muffle furnace maintaining consistent temperatures and geometry to produce rod lenses with excellent optical properties and reduced production time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multi-stage melting processes with homogenization steps and additional H2 loading are used to achieve high optical homogeneity, then optical quality is improved, but production time and process complexity increase
Solution Approach 1:
The production process is divided into distinct stages: initial melting in a first crucible, homogenization treatment, transfer to a second crucible, and final forming. This segmentation allows each stage to be optimized independently, achieving high optical homogeneity while managing process complexity through systematic breakdown of operations.
Solution Approach 2:
Homogenization treatment is performed in advance before the final forming stage. The glass material undergoes prolonged heating and stirring to ensure uniform composition and eliminate inhomogeneities before being transferred to the forming crucible, thereby pre-establishing the optical quality required for the final product.
2Shape
If high temperatures of 1700°C and above are used during die-casting to achieve desired shape, then forming capability is improved, but material property changes and production time increase
Solution Approach 1:
The process utilizes controlled temperature variations: initial melting at high temperatures (1700°C and above), followed by homogenization at slightly lower temperatures, and final forming at controlled temperatures. This parameter optimization achieves the desired rod lens shape while minimizing excessive production time and material degradation.
3Manufacturing precision
If multiple sinking cycles are used to achieve desired rod lens body shape, then geometric precision is improved, but production time and material loss increase
Solution Approach 1:
The glass material is pre-formed into a cylindrical shape with dimensions close to the final rod lens body before the sinking process. This preliminary shaping reduces the number of sinking cycles required, thereby improving production efficiency while maintaining the geometric precision needed for the final product.
4Shape
If graphite molds are used for die-casting to achieve desired shape, then forming capability is improved, but mold lifespan is limited and manufacturing cost increases
Solution Approach 1:
The process employs disposable or limited-life graphite molds that are replaced after a certain number of uses. While individual molds have limited lifespan, this approach simplifies the overall manufacturing system and reduces the need for expensive mold maintenance and repair infrastructure, thereby improving ease of manufacture despite increased material consumption.
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
This method enables the production of long, narrow rod lenses with high optical homogeneity and low fluorescence, achieving high transmission in the ultraviolet range, while reducing production time and costs, and allowing for precise control of material properties throughout the length of the rod lens.
Implementation Method 1
a rod lens base body consisting of a synthetic quartz glass material in the form of a fused silica ingot is manufactured using a flame hydrolysis process. This involves a direct, single-stage deposition process of SiO2 particles from a flame stream onto a rotating and movable die
Data Source
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AI summary
Manufacturing rod lenses with an enveloping diameter of the rod lens end face of 200 mm and an edge length of 800 mm by manufacturing a cylindrical body made of a synthetic quartz glass material in the form of a fused silica ingot, comprises a step of flame hydrolysis comprising carrying out a direct single-step deposition of silicon dioxide particles (I) made of a flame current on a rotating stamp sliding at the flame current. Manufacturing rod lenses with an enveloping diameter of the rod lens end face of 200 mm and an edge length of 800 mm by manufacturing a cylindrical body made of a synthetic quartz glass material in the form of a fused silica ingot, comprises a step of flame hydrolysis comprising carrying out a direct single-step deposition of silicon dioxide particles of formula (SiO x) (I) made of a flame current on a rotating stamp sliding to the flame current. x : not defined. An independent claim is also included for an apparatus for producing a rod lens main body in cylindrical shape, comprising: a muffle furnace with a multi-layered tubular- or tunnel-shaped muffle (1); a burner (2) with a feed line (3) for silicon-containing reactant, guided into a first side in the muffle; and a stamp (4) sliding opposite side to the burner on a second side of the muffle. The muffle comprises muffle geometry with a distance between the lateral surface of the forming base body (5) and an inner wall of the muffle of 40-75 mm, and a distance between the muffle and the melting surface of the base body of 10-25 mm. The muffle exhibits an exhaust-controlled furnace temperature of 1100-1300[deg] C.