Beveled Fiber Endcap for High-Power Laser Collimation
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Solution Overview
Problem
Fiber optic collimators in high-power laser applications face issues with beam truncation, leading to parasitic radiation that can heat components or require additional heat management, especially in multi-channel fiber arrays with restricted apertures, where the truncated beam can deliver significant power and impact equipment operation.
Innovation Solution
A fiber optic collimator with a beveled fiber endcap redirects peripheral beam portions that would otherwise form parasitic losses, ensuring that substantially all light is collimated and transmitted, using a beveled endcap that circumscribes a central region to redirect beam tails into the lens, thereby minimizing truncation and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a collimating lens with restricted aperture is used in high-power fiber laser applications, then the beam quality and collimation are improved, but parasitic radiation from beam truncation causes heating and energy loss
Solution Approach 1:
The patent extracts the harmful peripheral portion of the beam by introducing a beveled endcap that physically removes the truncated beam tails before they can scatter and cause parasitic heating. The bevel angle is specifically designed to redirect these peripheral rays away from the optical path, effectively separating the useful collimated beam from the harmful scattered radiation.
Solution Approach 2:
The patent converts the potentially harmful truncated beam portions into a beneficial configuration by using the beveled endcap to redirect these rays onto the lens aperture edge or away from sensitive components. This transforms what would be parasitic heating into controlled radiation that can be managed or even used for aperture definition.
2Ease of operation
If the aperture of the output collimating lens is restricted, then the collimated beam control is improved, but the truncated beam delivers significant power that heats components
Solution Approach 1:
The patent applies preliminary action by pre-modifying the fiber endcap with a bevel before the beam enters the collimating lens. This pre-modification ensures that the beam is already shaped to match the lens aperture, preventing truncation from occurring at the lens and thereby eliminating the source of component heating before it can occur.
3Temperature
If additional components are added to absorb or radiate heat from truncated beam, then the heat management is improved, but the device complexity increases
Solution Approach 1:
The patent eliminates the need for additional heat management components by extracting the harmful truncated beam portions at their source through the beveled endcap. This prevents the generation of parasitic heat in the first place, removing the need for heat sinks, cooling systems, or other thermal management components that would increase device complexity.
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 beveled endcap design effectively reduces parasitic radiation, allowing for high-power transmission without overheating, enabling efficient operation in high-power laser applications by minimizing the fraction of power lost as heat, thus improving the reliability and performance of fiber optic collimators.
Implementation Method 1
The bevel circumscribes a central region (a facet) such that the bevel redirects a peripheral portion of a light beam propagated by the fiber to the endcap, where the redirected light would otherwise form parasitic losses into the lens
Data Source
AI summary
A method and apparatus for controlling propagation of a light beam using a beveled endcap of an optical fiber, where the endcap has a first end coupled to the optical fiber and a second end having a bevel that circumscribes a facet. The bevel has an angle relative to the plane of the facet that directs a peripheral portion of the light beam towards a lens and the facet directs a central portion of the light beam towards the lens. As such, the light beam is collimated with substantially all of the power of the light beam propagating through the lens and all the power delivered with fiber core to the output endcap is propagating through the lens despite the divergence of the delivered beam and a restricted aperture of the lens.