Blue Laser Diode Array Assembly for High-Brightness Beam Combining
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Solution Overview
Problem
Existing laser systems face challenges in combining multiple laser beam sources into a single high-brightness, high-power beam while maintaining beam quality, due to difficulties in beam alignment, power management, and preserving brightness.
Innovation Solution
The development of an array assembly system comprising multiple laser diode assemblies with spatial combining mechanisms, including polarization beam combiners and Raman converters, to enhance beam power and brightness while maintaining beam parameter product within acceptable limits, allowing for coupling into optical fibers for targeted applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple laser beams are combined to increase power, then the power output is improved, but beam alignment difficulty increases
Solution Approach 1:
The system divides the laser source into multiple independent laser diodes arranged in an array, where each diode can be individually controlled and aligned. This segmentation allows for modular assembly and simplified alignment procedures compared to aligning multiple complete laser systems.
Solution Approach 2:
Multiple laser beams from individual diodes are spatially combined using beam combining optics to create a single high-power output beam. The beams are merged in a controlled manner while maintaining their individual alignment characteristics, resolving the contradiction between power accumulation and alignment complexity.
2Power
If multiple laser beams are combined to increase power, then the power output is improved, but beam quality is lost
Solution Approach 1:
Each laser diode in the array maintains its own beam quality characteristics locally, and the beam combining optics are designed to preserve these local qualities in the combined output. This ensures that the high-power combined beam retains the desirable beam quality parameters of the individual sources.
Solution Approach 2:
The system replaces mechanical beam combining methods with optical field-based combining techniques that better preserve beam quality. The optical design allows for coherent or incoherent combination while maintaining beam parameter integrity, avoiding the quality degradation associated with simpler mechanical approaches.
3Area of stationary object
If laser diodes are placed close together to increase density, then the device size is reduced, but beam alignment becomes more difficult
Solution Approach 1:
The laser diodes are arranged in a two-dimensional array configuration rather than a linear arrangement, allowing for compact packaging while maintaining sufficient separation for alignment. The spatial distribution in multiple dimensions enables both high density and manageable alignment requirements.
Solution Approach 2:
Beam combining optics serve as intermediaries between the closely-spaced laser diodes and the final output, managing the alignment requirements. These optical elements facilitate the combination of beams from densely packed diodes while maintaining alignment precision, effectively mediating between the compact layout and alignment needs.
4Power
If multiple laser beams are combined to increase power, then the power output is improved, but power management complexity increases
Solution Approach 1:
The system employs a universal power management architecture where a single power supply unit can control multiple laser diodes through current distribution networks. This multi-functional design allows one power management system to handle the entire array, reducing overall complexity compared to having separate power systems for each diode.
Solution Approach 2:
The laser diode array incorporates self-regulating characteristics where the optical combining process and thermal management design allow the system to automatically balance power distribution among diodes. This self-service capability reduces the need for complex external power management controls.
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 system achieves a combined laser beam with significantly increased power, up to 100 times that of individual beams, while preserving brightness and maintaining a beam parameter product similar to the individual beams, enabling efficient delivery for manufacturing, medical, and entertainment applications.
Implementation Method 1
The art of semiconductor lasers, as well as other laser sources, e.g., fiber lasers, is rapidly evolving with new laser sources being continuously developed and providing existing and new laser wavelengths
Implementation Method 2
Raman converters, to name a few
Data Source
AI summary
There is provided assemblies for combining a group of laser sources into a combined laser beam. There is further provided a blue diode laser array that combines the laser beams from an assembly of blue laser diodes. There are provided laser processing operations and applications using the combined blue laser beams from the laser diode arrays and modules.