Rectangular Quartz Core Optical Fiber for Uniform Laser Beam Transmission
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Solution Overview
Problem
Conventional optical fibers with circular cores and claddings face challenges in achieving uniform laser beam intensity distribution due to limitations in numerical aperture and material compatibility, leading to difficulties in transmitting high-energy density laser beams effectively.
Innovation Solution
An optical fiber with a quartz core having a rectangular cross section and a resin cladding with a circular outer shape, where the core's corners have a specific radius of curvature, allowing for uniform laser beam emission and high-energy density transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a core and cladding are both made of quartz to achieve high numerical aperture, then light transmission capability is improved, but laser beams escape due to mode scrambling and transmission of higher-order mode laser beams becomes difficult
Solution Approach 1:
The patent uses a composite structure where the core is made of quartz and the cladding is made of resin. This combination allows the core to maintain high numerical aperture for efficient light transmission while the resin cladding provides stability to prevent mode scrambling and laser beam escape, thus resolving the contradiction between high numerical aperture and transmission stability.
2Ease of manufacture
If a core and cladding are both made of resin to simplify structure, then manufacturing is easier, but laser beams with high energy density may melt the fiber
Solution Approach 1:
The patent employs a composite material structure with a quartz core and resin cladding. The quartz core provides high heat resistance to withstand high energy density laser beams, while the resin cladding maintains ease of manufacture and simplifies the fabrication process, thus resolving the contradiction between manufacturing simplicity and heat resistance.
3Stability of the object's composition
If mode scrambling is implemented by winding optical fiber to achieve uniform light intensity distribution, then uniformity is improved, but the optical fiber may be broken and the device size increases
Solution Approach 1:
The patent uses an asymmetric rectangular cross-section core instead of a conventional circular core. This asymmetric geometry inherently promotes mode mixing and achieves uniform light intensity distribution at the output without requiring external mode scramblers, thus resolving the contradiction between light intensity uniformity and device complexity.
4Stability of the object's composition
If a rectangular core cross section is used to achieve uniform light intensity distribution, then irradiation uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies optimal parameter ranges for the rectangular core dimensions and aspect ratio that naturally achieve uniform light intensity distribution. By optimizing these parameters, the patent reduces the stringency of manufacturing precision requirements while maintaining the benefit of uniform irradiation, thus resolving the contradiction between irradiation uniformity and manufacturing precision.
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 optical fiber design ensures uniform laser beam intensity distribution and effective transmission of high-energy density beams, overcoming previous limitations in mode scrambling and material compatibility.
Implementation Method 1
since the cladding is made of resin generally having a low refractive index, the refractive index of the cladding is lower than that of the core. Thus, a laser beam entering the core is transmitted while being repeatedly reflected off the interface between the core and the cladding
Data Source
AI summary
An optical fiber includes a core (1a) having an oblong rectangular or square cross section and made of quartz, and a cladding (2) surrounding the core (1a), having a circular outer cross-sectional shape, and made of resin.