Fiber-Coupled Laser Dynamic Beam Control
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Solution Overview
Problem
Conventional laser systems lack the ability to vary optical beam characteristics, such as intensity distribution and divergence, on short timescales, which is necessary for optimizing processes like materials processing, sensing, and illumination, due to the limitations of free-space optics, including cost, complexity, and reliability issues.
Innovation Solution
A fiber-based system that varies optical beam characteristics by perturbing the fiber itself, using methods like bending or introducing perturbations, allowing for continuous adjustment of beam characteristics during both setup and runtime, with feedback loops for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If free-space optics are used to vary beam characteristics, then beam tuning capabilities are provided, but cost, complexity, and reliability deteriorate
Solution Approach 1:
The patent replaces free-space optical systems with an all-fiber system that uses a photonic crystal fiber structure to achieve beam characteristic variation. The fiber-based approach eliminates mechanical free-space optics while maintaining the ability to tune beam parameters through fiber design and operational adjustments.
Solution Approach 2:
The patent varies beam characteristics by changing operational parameters such as drive current to the laser diode, which modifies the injection current and thereby changes the optical beam properties including intensity distribution and divergence. This allows dynamic beam tuning without complex optical mechanisms.
2Adaptability or versatility
If free-space optics are used to vary beam characteristics, then beam tuning capabilities are provided, but reliability deteriorates due to sensitivity to contamination or misalignment
Solution Approach 1:
The patent replaces free-space optical components that are sensitive to contamination and misalignment with an all-fiber coupled system. The fiber optic structure inherently protects the optical path, eliminating the reliability issues associated with exposed free-space optics while maintaining beam tuning capabilities through fiber-based mechanisms.
3Device complexity
If conventional lasers are used, then system simplicity is maintained, but beam characteristic variation capability is lost
Solution Approach 1:
The patent enables beam characteristic variation in a fiber-coupled laser by changing operational parameters such as drive current. This allows conventional fiber laser systems to gain dynamic beam tuning capabilities without requiring fundamentally complex additional components, maintaining relative simplicity while adding adaptability.
Solution Approach 2:
The patent makes the fiber-coupled laser system multi-functional by enabling it to provide both stable beam output and dynamic beam characteristic variation through the same optical path. The all-fiber system serves multiple purposes: laser generation, beam delivery, and beam tuning, eliminating the need for separate tuning mechanisms.
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
Enables precise and dynamic control of beam characteristics, reducing costs and complexity while improving process efficiency and reliability by maintaining adjusted beam characteristics within the fiber, even in high-power materials processing applications.
Implementation Method 1
an optical fiber comprising a first length of fiber and a second length of fiber, the second length of fiber comprising a confinement region
Data Source
AI summary
Methods, apparatus, and systems comprising a fiber-coupled laser and time-varying beam characteristics. A laser may generate an optical beam that is launched into one or more lengths of fiber, at least one of which comprises a confinement region that is optically coupled to an output. A perturbation device may modulate, through action upon the one or more lengths of fiber, a beam characteristic over a time period during which the laser is energized. A controller may cause the perturbation device to act upon the one or more lengths of fiber to impart a time-averaged beam characteristic and/or to induce a continuous variation in one or more beam characteristics during system use. A process monitor may sense a metric external to the optical system, and a feedback signal from the process monitor may be coupled into the controller. Dynamic beam characteristics may be modulated based on the feedback signal.