High-Power Fiber Cladding Power Stripper Using Grating Diffraction
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Solution Overview
Problem
High-power fiber lasers face beam quality degradation and potential system destruction due to residual pump energy, which conventional high refractive index coating methods cannot effectively manage for multi-kilowatt systems.
Innovation Solution
A high-power fiber cladding power stripper with a core unit, a cladding layer, and a grating structure that utilizes diffraction effects to direct and dissipate residual pump energy, incorporating a grating structure manufactured using techniques like photomask lithography or direct laser writing, allowing for controlled diffraction efficiency and heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a high refractive index coating (glue) method is used to remove residual pump energy, then the residual pump light can be directed out of the inner cladding layer and converted to heat, but the polymer glue material temperature increases and burns when temperature exceeds 150°C, limiting application to about 100 W power levels
Solution Approach 1:
The patent changes the material parameter from polymer glue to metal material with high melting point, enabling the system to withstand temperatures above 150°C and handle multi-kilowatt power levels. This parameter change resolves the temperature limitation of the conventional glue method.
Solution Approach 2:
The patent uses a composite structure consisting of a metal material layer with high refractive index and high melting point properties, combined with the fiber structure. This composite material approach allows simultaneous achievement of optical functionality (refractive index matching) and thermal stability (high temperature resistance).
2Power
If conventional high refractive index coating method is used, then residual pump light can be scattered and converted to heat, but the method cannot handle multi-kilowatt fiber laser systems due to material temperature limitations
Solution Approach 1:
The patent changes the thermal parameter of the coating material from polymer (low temperature tolerance) to metal (high temperature tolerance), enabling reliable operation at multi-kilowatt power levels without material degradation or burnout.
Solution Approach 2:
The patent replaces the short-lived polymer glue material that burns at high temperatures with a durable metal material that can withstand continuous high-power operation, significantly improving system reliability and component lifespan.
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
Effectively removes residual pump energy, preventing beam quality degradation and system damage by uniformly dispersing and dissipating energy within the capabilities of the material, suitable for high-power applications beyond the limitations of conventional methods.
Implementation Method 1
The grating structure, disposed outside the cladding layer, is for producing diffraction effects
Implementation Method 2
The working principle of this method is to direct the residual pump lights within the cladding layer out of the inner cladding layer by applying the optical refraction and scattering effects
Implementation Method 3
The working principle of this method is to direct the residual pump lights within the cladding layer out of the inner cladding layer by applying the optical refraction and scattering effects
Data Source
AI summary
A high-power fiber cladding power stripper comprises a core unit, a cladding layer, a grating structure, and a jacket. The core unit is an optical conductive material. The cladding layer is disposed outside the core unit, wherein a refractive index of the cladding layer is lower than that of the core unit. The grating structure, disposed outside the cladding layer, is for producing diffraction effects. The jacket surrounds and protects the core unit, the cladding layer, and the grating structure. Hence, in a high-power fiber laser system, the cladding power stripper can be utilized for removing residual pump energy before the laser light entering an output collimator.