Beam-Shaping Optical Fiber Structure for Variable Laser BPP
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Solution Overview
Problem
High-power laser systems require frequent adjustments to achieve varying beam parameter products (BPP) and beam shapes for different materials and processes, which is time-consuming and costly, and often results in damage to fragile optical components.
Innovation Solution
The development of optical fibers with complex core and cladding configurations, such as graded refractive index profiles and low-refractive-index barrier layers, allows for the variation of BPP and beam shapes without altering the output optical system, enabling the formation of a wide range of BPPs and beam shapes unattainable with conventional fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the output optical system or optical fiber is swapped out to change BPP, then the beam quality can be adjusted for different materials and processes, but the system becomes time-consuming and costly with increased risk of damage to optical components
Solution Approach 1:
The patent implements dynamic BPP adjustment by enabling continuous variation of the laser beam's coupling position at the fiber input through a controlled scanning mechanism. This allows the beam parameter product to be changed in real-time without physically reconfiguring the optical system, directly resolving the contradiction between adaptability and time loss.
Solution Approach 2:
The optical fiber itself is designed with complex internal structures (graded-index core, multiple cladding layers with specific refractive indices) that enable it to autonomously shape and control the beam parameters based on the coupling position. The fiber's inherent optical properties provide the adaptability function, eliminating the need for external optical component swapping.
2Adaptability or versatility
If the output optical system is swapped out to achieve different BPP values, then various beam qualities can be obtained, but the complexity and cost of the system increases
Solution Approach 1:
The patent extracts the beam shaping and BPP control function from the external optical system and relocates it entirely within the optical fiber structure. By designing the fiber with specific core and cladding refractive index profiles, the fiber itself performs the function previously requiring separate optical components, thereby reducing system complexity while maintaining versatility.
Solution Approach 2:
The optical fiber employs a composite structure with multiple layers having different refractive indices (graded-index core, inner cladding, outer cladding). This composite design enables the fiber to provide multiple beam shaping functions simultaneously, achieving various BPP values without requiring multiple separate optical components.
3Adaptability or versatility
If frequent adjustments are made to the optical system, then the desired beam parameters can be achieved for different processes, but the risk of damage to fragile optical components increases
Solution Approach 1:
The optical fiber's internal structure is designed to autonomously control beam parameters based on the input coupling position. This self-service mechanism eliminates the need for frequent manual adjustments of external optical components, thereby reducing the risk of damage and improving reliability while maintaining adaptability.
Solution Approach 2:
The patent replaces mechanical adjustment of optical components with a non-contact method of controlling beam parameters through electronic scanning of the coupling position. This substitution eliminates the mechanical handling and adjustment of fragile optical elements, directly improving reliability while preserving beam parameter control capability.
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 minimizes optical power losses and allows for dynamic control of laser beams, enabling efficient processing of various materials and processes without the need for frequent system adjustments or damage to optical components.
Implementation Method 1
Optical fibers in accordance with embodiments of the invention feature an annular core region incorporating (i) a sub-region of graded refractive index, (ii) sub-regions having different refractive indices in a stepped profile, or (iii) a low-refractive-index barrier layer
Implementation Method 2
Optical fibers having complex configurations of core and cladding regions... enable variation of the BPP and/or shape of an output laser beam
Data Source
AI summary
In various embodiments, optical fibers have arrangements of core, annular core, and cladding regions enabling variation of beam shape and/or beam parameter product and may be utilized for the processing (e.g., welding, cutting, drilling, etc.) of various workpieces.