Twisted Photonic Crystal Fiber Rotary Beam
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for generating optical beams with annular shapes in optical fibers require expensive and alignment-sensitive free-space optics, leading to poor beam quality and undesirable processing outcomes due to the use of bulky and sensitive components in processing heads.
Innovation Solution
An optical fiber device with a unitary core that twists along its length, creating a rotary optical beam within the fiber, which maintains an annular beam shape without the need for free-space optics, by varying the refractive index structure and twisting the core to convert non-rotary optical beams into rotary guided modes or leaky waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If free-space optics are used to generate annular optical beams, then annular beam shape can be achieved, but device complexity and cost increase due to bulky and alignment-sensitive components
Solution Approach 1:
The patent replaces free-space optical components (mechanical/optical system) with a fiber-based photonic crystal fiber structure. The annular beam is generated through the unique waveguide modes of the photonic crystal fiber, eliminating the need for external optical elements like axicons or spiral phase plates, thus reducing device complexity while maintaining the annular beam shape.
Solution Approach 2:
The photonic crystal fiber structure itself generates the annular beam profile through its inherent geometric design and waveguide properties. The fiber's periodic structure and index contrast create modes that naturally produce the annular shape, eliminating the need for external optical components and reducing alignment requirements.
2Shape
If free-space optics are used in processing heads, then annular beam can be generated, but reliability decreases due to alignment sensitivity and bulkiness
Solution Approach 1:
The patent substitutes mechanical alignment-sensitive optical components with a robust fiber-based system. The photonic crystal fiber inherently guides and shapes the light, eliminating alignment issues and improving reliability in dynamic processing environments where mechanical stability is challenging.
Solution Approach 2:
The patent uses a flexible fiber structure (photonic crystal fiber) that can be easily integrated into processing heads and maintained under various conditions. The fiber's flexibility and robustness compared to bulkier optical components enhance reliability in mobile or dynamically adjusted processing systems.
3Device complexity
If conventional fiber optics are used, then device simplicity is maintained, but beam quality deteriorates due to inability to generate annular profiles
Solution Approach 1:
The patent modifies the geometric and optical parameters of the fiber structure (photonic crystal fiber) to enable annular beam generation. By adjusting the periodic structure, index contrast, and fiber dimensions, the system achieves high beam quality annular profiles while maintaining relative simplicity compared to free-space optical systems.
Solution Approach 2:
The photonic crystal fiber employs a composite structure combining different materials with distinct refractive indices arranged in a periodic pattern. This composite design enables the fiber to support specific waveguide modes that produce high-quality annular beams, achieving both structural simplicity and optical 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
This approach enables the generation of high-quality annular beam profiles with sharp edges, suitable for material processing, directly within the optical fiber, eliminating the need for costly and sensitive free-space optics and improving processing efficiency.
Implementation Method 1
the unitary core twists about an optical axis of the optical fiber device along a length of the optical fiber device... converting the optical beam to a rotary optical beam... the optical beam is at least partially converted to the rotary optical beam as a result of the unitary core being twisted about the optical axis
Implementation Method 2
a refractive index of the primary section is greater than a refractive index of the secondary section... varying the refractive index structure and twisting the core to convert non-rotary optical beams into rotary guided modes or leaky waves
Data Source
AI summary
An optical fiber device may include a unitary core including a primary section and a secondary section, wherein at least a portion of the secondary section is offset from a center of the unitary core, wherein the unitary core twists about an axis of the optical fiber device along a length of the optical fiber device, and wherein a refractive index of the primary section is greater than a refractive index of the secondary section; and a cladding surrounding the unitary core.