Optical Fiber Interlayer for Leakage Radiation Management
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Solution Overview
Problem
Optical fibers experience heat buildup and potential destruction due to leakage radiation at contact points and transitions, which reduces beam quality, especially with high laser power applications.
Innovation Solution
An optical fiber design with an interlayer between the fiber jacket and sheath, having a lower refractive index than the jacket, and an outputting means to direct leakage radiation away from the fiber core, preventing overheating and improving beam quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a mode stripper is attached at the separation layer between fiber jacket and sheath, then leakage radiation with high numerical aperture can be output, but the device complexity increases and bonding strength may be insufficient
Solution Approach 1:
The fiber structure is segmented into distinct layers: fiber core, fiber jacket, interlayer, and sheath. The interlayer acts as a separate functional element with specific optical properties (lower refractive index) to manage leakage radiation, dividing the radiation control function from the mechanical protection function.
Solution Approach 2:
The interlayer serves as an intermediary element between the fiber jacket and sheath. It mediates the optical interaction by having a lower refractive index than the fiber jacket, enabling controlled discharge of leakage radiation while maintaining mechanical integrity through adhesive bonding at contact spots.
2Temperature
If adhesive with low refraction index and low absorption is used for bonding, then radiation absorption and overheating are reduced, but bonding strength becomes insufficient
Solution Approach 1:
The interlayer has different optical properties (lower refractive index, lower absorption) specifically at the contact spots where adhesive is applied, while maintaining adequate bonding strength. This local optimization allows the adhesive to perform both bonding and radiation management functions without compromising either property.
Solution Approach 2:
The refractive index and absorption coefficients of the interlayer material are specifically optimized to be lower than the fiber jacket, changing the optical parameters to reduce radiation absorption and heat build-up at bonding locations while maintaining mechanical bonding strength.
3Loss of energy
If the sheath has low refraction index and poor absorption, then radiation transmission is improved, but heat build-up at contact spots increases leading to fiber destruction
Solution Approach 1:
The interlayer acts as an intermediary with lower refractive index and lower absorption than both the fiber jacket and sheath. It mediates the radiation path by allowing controlled discharge of leakage radiation while preventing excessive heat build-up at contact spots where adhesive bonding occurs.
Solution Approach 2:
The interlayer converts potentially harmful leakage radiation into a beneficial discharge mechanism by using its lower refractive index to redirect radiation away from the fiber core and contact spots, while its lower absorption property converts what would be heat-generating trapped radiation into safely transmitted energy.
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 interlayer effectively reduces leakage radiation, preventing overheating and enhancing beam quality by directing radiation away from critical areas, thus reducing the risk of fiber damage and maintaining high-quality transmission.
Implementation Method 1
a interlayer (4) having a lower refractive index than the fiber jacket (2, 3) is provided between the fiber jacket (2, 3) and the sheath (5)
Data Source
AI summary
An optical fiber for transmitting laser beams includes at least one fiber core, at least one fiber jacket, a sheath encompassing the fiber jacket, an interlayer between the fiber jacket and the sheath, in which the refractive index of the interlayer is lower than a refractive index of the corresponding fiber jacket that is in contact with the interlayer, and an outputting means for outputting leakage radiation from the fiber.