Multi-Clad Fiber Laser Beam Switching via Deformable Mirror
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Solution Overview
Problem
Existing methods for adapting laser beam characteristics in multi-clad optical fibers for high-power lasers are complex and inefficient, as they often require interruption of propagation to adjust the beam's profile, limiting the use of total power and being costly.
Innovation Solution
An apparatus with selectable optical paths allows for coupling optical fibers to a multi-clad fiber, enabling flexible distribution of power between the core and cladding, and switching between different laser modules to achieve quasi-Gaussian, annular, or mixed laser profiles, using optical switches and adjustable components to manage power distribution within the fiber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fiber lasers manufacturers employ methods of bending the output fiber or actuators to change the refractive index to direct the beam from the core to the cladding, then the beam can be directed between core and cladding, but the device complexity and cost increase significantly
Solution Approach 1:
The patent employs a deformable mirror that can dynamically change its surface shape to redirect the laser beam between core and cladding modes. This dynamic element replaces complex mechanical bending systems or refractive index actuators, achieving beam direction control through a single adjustable optical component that can be controlled electronically without mechanical intervention in the fiber path.
Solution Approach 2:
The invention replaces mechanical fiber bending methods with an optical control mechanism using a deformable mirror. Instead of physically manipulating the fiber geometry through mechanical means, the system uses optical wavefront modulation to achieve the same effect of directing energy between core and cladding, thereby eliminating complex mechanical systems.
2Adaptability or versatility
If free-space coupling devices are inserted to direct the laser beam into the core or cladding, then the beam can be directed appropriately, but propagation must be interrupted which reduces efficiency and increases complexity
Solution Approach 1:
The patent maintains continuous laser beam propagation through the fiber by using a deformable mirror to modulate the wavefront of the beam already traveling in the fiber. This approach eliminates the need to interrupt propagation to insert free-space coupling devices, as the beam remains continuously guided through the fiber while its distribution between core and cladding is dynamically adjusted.
Solution Approach 2:
The deformable mirror acts as an intermediary element that interfaces with the laser beam within the fiber system without requiring interruption of the fiber path. It mediates the energy distribution between core and cladding modes through wavefront modulation, allowing flexible beam coupling while maintaining continuous propagation efficiency.
3Adaptability or versatility
If optical components are used to direct the laser beam into the core or cladding, then the beam characteristics can be adapted, but the total power cannot be fully utilized in both circumstances simultaneously
Solution Approach 1:
The system uses a deformable mirror to dynamically control the distribution of total laser power between core and cladding modes in real-time. This allows the full power to be utilized for either core propagation or cladding propagation or any combination thereof, depending on the application requirements, without the limitations of fixed optical components that would force power division.
Solution Approach 2:
The invention changes the wavefront parameters of the laser beam using a deformable mirror to achieve different power distributions between core and cladding. By modulating the wavefront curvature and phase, the system can redirect the same total power into different spatial modes without energy loss, maximizing power utilization efficiency while maintaining adaptability.
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 solution allows for easier scaling of power between the core and cladding, enabling efficient use of all available power and flexible profile adjustments, overcoming the limitations of previous methods by allowing full-glass propagation and reducing complexity and cost.
Implementation Method 1
an optical switch having a first input port and two output ports, each output port being respectively coupled to a respective one of the sets of input channels, the optical switch being controllable for switching between the first optical path and the second optical path
Data Source
AI summary
An apparatus comprises a multi-clad fiber that includes a light-guiding core surrounded by at least a cladding layer, and an input interface including a first set of input channels in the core configured to receive a first optical fiber, and a second set of input channels in the cladding layer configured to receive a second optical fiber. The apparatus further includes an optical switch module having an input port, a first and a second output port, a first optical path between the input port and the first input channel, and a second optical path between the input port and a second input channel in the second set of input channels. The optical switch module is controllable to switch between the first and the second optical paths. The apparatus also includes a set of laser modules.