In-Fiber Beam Adjustment for Materials Processing
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Solution Overview
Problem
Current fiber-coupled laser systems for materials processing lack the ability to adjust beam characteristics efficiently and cost-effectively, often requiring complex and costly add-on mechanisms like free-space optics, which compromise performance and reliability.
Innovation Solution
The development of an in-fiber apparatus that adjusts beam characteristics by modifying the refractive-index profile and using perturbation devices to change beam properties within the fiber, allowing for variable beam characteristics without the need for free-space optics, enabling tailored beam settings for specific processing tasks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If free-space optics or complex add-on mechanisms are used to adjust beam characteristics, then beam characteristics can be varied, but cost, device complexity, and reliability are significantly degraded
Solution Approach 1:
The patent extracts the beam adjustment functionality from external free-space optics and integrates it directly into the fiber structure itself. By incorporating variable refractive-index regions and perturbation devices within the fiber, the system eliminates the need for complex external adjustment mechanisms while maintaining beam characteristics adjustability.
Solution Approach 2:
The patent embeds multiple functional regions (variable refractive-index regions, confinement regions, and perturbation devices) nested within the fiber structure. The first length of fiber with variable refractive-index profile is nested within or coupled to the second length of fiber with confinement regions, creating a compact integrated system that provides beam adjustment without external components.
2Adaptability or versatility
If free-space optics or complex add-on mechanisms are used to adjust beam characteristics, then beam characteristics can be varied, but cost and device complexity increase significantly
Solution Approach 1:
The patent merges the beam adjustment functionality with the fiber transmission medium itself. By integrating variable refractive-index regions and perturbation devices directly into the fiber structure, the system combines multiple functions (transmission + adjustment) into a single component, eliminating the need for separate free-space optics and reducing overall system cost.
Solution Approach 2:
The fiber structure itself provides the beam adjustment capability through its integrated variable refractive-index regions and perturbation devices. The system serves its own adjustment needs internally without requiring external free-space optics or additional complex components, thereby reducing manufacturing cost and simplifying the overall system.
3Adaptability or versatility
If free-space optics are used to vary beam characteristics, then beam characteristics can be adjusted, but performance degradation occurs due to optical loss and delays
Solution Approach 1:
The patent extracts the beam adjustment process from free-space optics and relocates it entirely within the guided wave environment of the fiber. By performing all beam characteristic adjustments while the light remains confined within the fiber core, the system eliminates optical loss associated with free-space propagation, coupling, and alignment.
Solution Approach 2:
The fiber medium itself acts as an intermediary that enables beam adjustment without requiring the light to exit into free space. The variable refractive-index regions and perturbation devices within the fiber serve as intermediaries that modify beam characteristics while maintaining optical confinement, thereby avoiding the optical losses inherent in free-space optics systems.
4Adaptability or versatility
If free-space optics are used to adjust beam characteristics, then beam characteristics can be varied, but reliability is reduced due to reduced robustness and up-time
Solution Approach 1:
The patent extracts the adjustment mechanism from external free-space optics and integrates it directly into the fiber structure. This integration eliminates the external components that are susceptible to misalignment, contamination, and mechanical failure, thereby significantly improving system reliability and robustness while maintaining beam adjustability.
Solution Approach 2:
The patent merges the adjustment functionality with the fiber transmission medium, creating a single integrated component. This consolidation eliminates the interfaces and alignment requirements between separate components (fiber + free-space optics), reducing potential failure points and improving overall system reliability and up-time.
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 solution provides flexible and predictable adjustment of beam characteristics for materials processing, enhancing the efficiency and reliability of applications like brazing, cladding, glazing, and welding by minimizing cost and complexity, while maintaining performance.
Implementation Method 1
launching the optical beam into a first length of fiber having a first refractive-index profile (RIP)
Implementation Method 2
coupling the optical beam from the first length of fiber into a second length of fiber having a second RIP and one or more confinement regions
Data Source
AI summary
A method of materials processing using an optical beam includes: launching the optical beam into a first length of fiber having a first refractive-index profile (RIP); coupling the optical beam from the first length of fiber into a second length of fiber having a second RIP; modifying one or more beam characteristics of the optical beam in the first length of fiber, in the second length of fiber, or in the first and second lengths of fiber; and/or generating an output beam, having the modified one or more beam characteristics of the optical beam, from the second length of fiber. The first RIP can be the same as or differ from the second RIP. The modifying of the one or more beam characteristics can include changing the one or more beam characteristics from a first state to a second state. The first state can differ from the second state.