Multi-Clad Fibre Beam Coupling with Polarization Beam Switching
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Solution Overview
Problem
Existing methods for coupling a laser beam into a multi-clad fiber face challenges in efficiently adjusting beam quality due to the complexity of manufacturing mechanically retractable wedge beam switches and their sensitivity to misalignment.
Innovation Solution
A device comprising a beam switch with at least two birefringent optical wedges and a polarization-influencing device, along with an in-coupling optical unit, is used to divide and couple the laser beam into multiple sub-laser-beams, which are then aligned into different cores of the multi-clad fiber, allowing for adjustable power distribution and improved beam quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanically retractable wedge beam switch is used to adjust beam quality, then beam quality can be adjusted, but the device becomes difficult to manufacture and sensitive to misalignment
Solution Approach 1:
The patent replaces the mechanically retractable wedge beam switch with a polarization-based beam switching mechanism. Instead of mechanically moving components to divert the beam, the invention uses polarization-influencing devices (such as wave plates or polarization rotators) combined with polarization-dependent optical elements to route different polarization states of the laser beam into different cores of the multi-clad fiber. This substitution eliminates mechanical complexity and misalignment issues while maintaining beam quality adjustment capability.
Solution Approach 2:
The invention changes the control parameter from mechanical position to polarization state. By using polarization-influencing devices to rotate or modify the polarization state of the incident laser beam, the system can dynamically switch which core receives the beam. This parameter change approach simplifies the mechanical structure and reduces sensitivity to alignment errors, as polarization control can be achieved through precise optical element orientation rather than mechanical positioning.
2Adaptability or versatility
If polarization splitting is used to map sub-laser-beams into different cores, then beam quality can be adjusted, but the power distribution becomes sensitive to laser beam position changes
Solution Approach 1:
The patent introduces polarization-influencing devices as intermediary elements between the incident laser beam and the polarization splitting optics. These devices (such as wave plates or polarization rotators) act as mediators that can adjust the polarization state of the beam before it enters the splitting stage. By controlling the polarization state through these intermediaries, the system can achieve stable power distribution between cores that is independent of small positional variations in the laser beam, as the polarization control mechanism compensates for position-induced variations.
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 solution enables precise control over the power distribution and beam quality by effectively coupling sub-laser-beams into specific cores of the multi-clad fiber, reducing manufacturing complexities and misalignment issues.
Implementation Method 1
The beam switch includes at least two birefringent optical wedges
Implementation Method 2
at least one polarization-influencing device having an adjustable polarization-influencing effect
Data Source
AI summary
A device for coupling a laser beam into a multi-clad fiber includes a beam switch for dividing the laser beam into a plurality of sub-laser-beams. The beam switch includes at least two birefringent optical wedges, and at least one polarization-influencing device having an adjustable polarization-influencing effect and being arranged between the at least two birefringent optical wedges. The device further includes an in-coupling optical unit for coupling the plurality of sub-laser-beams exiting the beam switch into the multi-clad fiber. The in-coupling optical unit is configured to couple at least two of the plurality of sub-laser-beams exiting the beam switch into at least two different light-conducting cores of the multi-clad fiber.