Coherent Laser Array Phase Locking With Seed Beam Injection
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Solution Overview
Problem
Existing laser array systems struggle to generate coherent emission efficiently, especially at power ranges beyond the kilowatt range, due to challenges in achieving and maintaining coherence among individual laser emitters.
Innovation Solution
The system achieves coherence by locking each laser emitter's beam to an identical optical phase using a seed laser. This is done by injecting a seed beam into the laser array, allowing it to interact with each emitter, and adjusting the phase of the seed beam using phase-changing elements to match the phase of the array beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional systems are used to produce coherent emission from laser arrays, then coherence can be achieved, but the systems become expensive, unwieldy, and difficult to adapt for mobile equipment or compact spaces
Solution Approach 1:
A seed laser is introduced as an intermediary device that emits a seed beam to initialize and control the phase of all laser emitters in the array. This single seed laser replaces the need for multiple independent phase control systems, simplifying the overall system while maintaining coherence across all emitters through the common seed beam reference
Solution Approach 2:
The seed laser performs preliminary phase initialization by emitting a seed beam that interacts with each laser emitter before the main lasing action occurs. This preliminary seeding establishes the correct phase relationship among all emitters, ensuring coherence is achieved without requiring complex real-time phase adjustment mechanisms
2Reliability
If conventional systems are used to produce coherent emission from laser arrays, then coherence can be achieved, but the power output is limited to watt or kilowatt ranges due to overheating risks
Solution Approach 1:
The laser array is divided into multiple independent emitters that are spatially distributed and individually seeded by the common seed beam. This segmentation allows each emitter to operate independently with its own heat dissipation path, enabling the system to scale to higher power levels (megawatt range) without the overheating limitations that constrain conventional unified laser systems
3Volume of moving object
If the seed laser is positioned close to the laser array to reduce system volume, then portability is improved, but heat management becomes more challenging
Solution Approach 1:
The seed laser is positioned in the same plane as the laser array rather than directly adjacent to it, utilizing the two-dimensional space available. This planar arrangement reduces the overall system volume and improves portability while maintaining adequate thermal separation, as heat can dissipate laterally across the array structure without requiring vertical stacking that would compromise cooling
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 highly coherent and controllable beams, allowing for the efficient transmission of high power (up to and exceeding megawatt ranges) with minimal destructive interference.
Implementation Method 1
the seed laser is configured to emit a seed beam that interferes with one or more array beams emitted by the one or more of the plurality of laser array emitters and locks the one or more array beams to a phase of the seed beam
Data Source
AI summary
A laser system may include a laser array comprising a plurality of laser array emitters and a seed laser. The seed laser may be positioned on and directed toward an emitting side of the laser array or may be optically coupled to the plurality of laser array emitters by a waveguide bordering the laser array. The seed laser may be configured to emit a seed beam that interferes with one or more array beams emitted by one or more of the laser array emitters and locks the one or more array beams to a phase of the seed beam. An adjustable micro-lens array positioned on an emitting side of the laser array may enable laser array beams to be steered to a target location.