One-Piece Small-Core Fiber Termination for High-Energy Laser Coupling
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Solution Overview
Problem
Existing fiber termination technologies for high-energy laser sources like holmium lasers face issues with damage thresholds, misalignment, and cladding mode excitation, leading to catastrophic failures and inefficiencies in coupling light into optical fibers.
Innovation Solution
A one-piece optical fiber termination apparatus with a passive optical taper that spatially reshapes light without reflections, ensuring propagation in one direction and maintaining constant core and cladding diameters, eliminating the need for additional lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-energy laser pulses are coupled directly into optical fibers with small core diameters, then coupling efficiency is improved, but the breakdown threshold of ambient air or damage threshold of fiber-optical surface is exceeded
Solution Approach 1:
The fiber termination is divided into multiple functional sections: a first section with a first core diameter and a second section with a second core diameter, where the first core diameter is larger than the second core diameter. This segmentation allows the larger first section to receive high-energy laser pulses without exceeding breakdown thresholds, while the smaller second section maintains efficient coupling to the target fiber.
Solution Approach 2:
The fiber termination structure acts as an intermediary between the laser source and the target optical fiber. The multi-section design with varying core diameters serves as a mediator that transforms the laser beam profile, allowing high-energy pulses to be coupled in without causing air breakdown or surface damage.
2Ease of manufacture
If conventional fiber termination structures are used, then fabrication is simplified, but mutual alignment and orientation of constituent components is required producing compact integrated optical arrangements that are subject to breakage
Solution Approach 1:
Multiple functional elements are merged into a single integrated fiber termination structure. The first and second sections are combined in one piece, eliminating the need for separate alignment of constituent components. This integration maintains fabrication simplicity while dramatically improving reliability by removing alignment-sensitive interfaces that are prone to breakage.
3Strength
If laser focusing optics are made structurally simple, then robustness is improved, but focal spots become atypically large, misshapen, unstable, and vary widely in parameters
Solution Approach 1:
The fiber termination structure performs the function of focusing and shaping the laser beam inherently through its multi-section design. The varying core diameters automatically adjust the beam profile without requiring external focusing optics, thereby maintaining robustness while achieving consistent focal spot quality through the self-focusing geometry of the termination itself.
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 enhances reproducible efficiency and reduces uncertainties in fiber termination, preventing damage and improving the longevity and performance of optical fiber systems.
Implementation Method 1
a passive optical taper that spatially reshapes light without reflections
Implementation Method 2
spatially reshapes light without reflections, ensuring propagation in one direction
Implementation Method 3
an optical fiber and a passive optical taper... configured to receive light... and propagate the light
Data Source
AI summary
An article of manufacture including a fiber optic termination of a small core optical fiber for use with a surgical laser apparatus (the output from which may be characterized by a high M2 factor) or other high-power or high-energy laser (including an appropriate fiber laser) is configured for safe and efficient coupling of light at a large laser focal point and/or to enable the process of coupling of radiant intensities exceeding the silica fiber damage thresholds and/or those ionizing the air if fully focused therein. The termination may include a glass cylinder structured to include a core region and a glass cladding region the ratio of dimensions of which is substantially equal to the ratio of respectively-corresponding dimensions of the employed optical fiber. A method of propagating light through such article of manufacture.