Optical Fiber Termination for High-Energy Laser Coupling
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Solution Overview
Problem
Current fiber-optic termination technologies face challenges in efficiently coupling high-energy laser pulses from holmium lasers into optical fibers without exceeding the damage threshold of the fiber or causing ionization breakdown, leading to issues like cladding mode excitation, attenuation, and burn-through failures due to misalignment and thermal distortions.
Innovation Solution
A one-piece optical fiber apparatus with a cylindrical body and intermediate glass components that propagate light in one direction, minimizing reflections and maintaining precise dimensions to ensure efficient coupling and reduce thermal-induced distortions, thereby preventing damage and improving beam quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional fiber-optic termination technologies are used to couple high-energy laser pulses into optical fibers, then coupling efficiency is reduced, but the damage threshold of the fiber is exceeded and ionization breakdown occurs
Solution Approach 1:
The patent introduces an intermediary optical element (such as a graded-index rod lens or optical adapter) between the laser source and the optical fiber. This intermediary component acts as a mediator that gradually transitions the laser beam parameters, reducing the abrupt coupling that causes damage while maintaining efficient energy transfer into the fiber core.
Solution Approach 2:
The patent employs parameter changes by using components with varying refractive indices (graded-index structures) and adjusting beam parameters (divergence, waist size) along the propagation path. These gradual parameter transitions prevent sudden stress concentrations that lead to fiber damage and ionization breakdown.
2Loss of energy
If misalignment occurs between fiber core and laser output, then coupling efficiency decreases, but thermal distortions increase leading to burn-through failures
Solution Approach 1:
The patent incorporates alignment mechanisms that allow for dynamic adjustment of the optical fiber position and orientation relative to the laser output. This dynamic capability enables real-time compensation for misalignment, maintaining optimal coupling efficiency while preventing the thermal buildup that causes burn-through failures.
Solution Approach 2:
The patent divides the coupling system into separable components (laser output stage, intermediary optical element, fiber input stage) that can be independently aligned and adjusted. This segmentation allows for precise alignment of each component, reducing misalignment-induced thermal distortions and preventing burn-through.
3Manufacturing precision
If conventional multi-component termination arrangements are used, then alignment precision is improved, but device complexity increases and susceptibility to breakage increases
Solution Approach 1:
The patent merges multiple alignment and positioning functions into a single integrated termination component. By combining what would traditionally require separate alignment elements into one unified structure, the patent achieves the necessary alignment precision while reducing the total number of components and eliminating complex assembly procedures.
Solution Approach 2:
The patent designs the termination component to perform multiple functions simultaneously: mechanical support, optical alignment, and beam shaping. This multi-functionality eliminates the need for separate specialized components for each function, reducing overall device complexity while maintaining manufacturing precision.
4Power
If high-power laser pulses are focused directly into optical fibers, then energy delivery is maximized, but the damage threshold of the fiber surface is exceeded
Solution Approach 1:
The patent implements preliminary action by using the intermediary optical element to pre-condition the laser beam before it enters the fiber. The beam parameters (size, divergence, intensity distribution) are adjusted in advance during the coupling process, ensuring that when the high-power pulse enters the fiber, the energy density remains below the damage threshold while still achieving effective energy delivery.
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 effectively couples high-energy laser pulses into optical fibers without causing damage or ionization breakdown, enhancing the reliability and longevity of surgical laser systems by maintaining beam quality and reducing attenuation.
Implementation Method 1
propagate light in one direction
Implementation Method 2
spatially reshape light that has been transferred to the optical fiber termination from (and, optionally, generated within) the constituent optical fiber such as to directly couple this light to a target optical element
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.