Optical Fiber Amplifier Doping Layout for Beam Profile Control
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Solution Overview
Problem
Existing fiber laser devices require a separate mechanism to change the beam profile of laser beams, which can cause optical loss and degrade beam quality.
Innovation Solution
An optical amplification apparatus with a first and second amplification optical fiber, each with a specific active element doping concentration distribution, and pumping light sources to control the propagation modes of light, allowing for the output of a desired beam profile without additional beam profile conversion mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a separate mechanism is used to change beam profile of laser beam outputted from optical amplifier, then beam profile can be changed, but optical loss increases and beam quality degrades
Solution Approach 1:
The patent combines the beam profile control function with the optical amplification function by integrating different doping concentration distributions within the amplification optical fiber itself. Instead of using a separate beam profile changing mechanism after amplification, the fiber structure is designed to directly output different beam profiles (fundamental mode or higher-order modes) while performing amplification, thereby eliminating additional optical components and reducing optical loss.
Solution Approach 2:
The patent applies local quality by creating different active element doping concentration distributions at different radial positions within the optical fiber core. The first region has a first doping concentration distribution optimized for fundamental mode amplification, while the second region has a second doping concentration distribution optimized for higher-order mode amplification. This localized differentiation allows the fiber to control beam profile characteristics internally without external mechanisms.
2Shape
If a separate mechanism is used to change beam profile of laser beam outputted from optical amplifier, then beam profile can be changed, but beam quality degrades
Solution Approach 1:
The patent merges the beam profile control function with the optical amplification function by integrating different doping concentration distributions within the amplification optical fiber itself. Instead of using a separate beam profile changing mechanism after amplification, the fiber structure is designed to directly output different beam profiles (fundamental mode or higher-order modes) while performing amplification, thereby eliminating additional optical components and reducing optical loss.
Solution Approach 2:
The patent applies local quality by creating different active element doping concentration distributions at different radial positions within the optical fiber core. The first region has a first doping concentration distribution optimized for fundamental mode amplification, while the second region has a second doping concentration distribution optimized for higher-order mode amplification. This localized differentiation allows the fiber to control beam profile characteristics internally without external mechanisms.
3Shape
If additional components are added to change beam profile, then beam profile can be adjusted, but device complexity increases
Solution Approach 1:
The patent makes the amplification optical fiber multi-functional by enabling it to simultaneously perform optical amplification and beam profile control. The fiber is designed with multiple doping concentration distributions that allow it to amplify different propagation modes (fundamental mode or higher-order modes) depending on the pumping conditions, eliminating the need for separate beam profile changing mechanisms and reducing overall device complexity.
Solution Approach 2:
The patent combines the beam profile control function with the optical amplification function by integrating different doping concentration distributions within the amplification optical fiber itself. Instead of using a separate beam profile changing mechanism after amplification, the fiber structure is designed to directly output different beam profiles (fundamental mode or higher-order modes) while performing amplification, thereby eliminating additional optical components and reducing optical loss.
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 apparatus effectively adjusts the laser beam profile without additional components, reducing optical loss and maintaining beam quality by controlling the propagation modes through differential doping and pumping light management.
Implementation Method 1
a first core to which an active element has been doped with a first active element doping concentration distribution
Implementation Method 2
an active element has been doped to the second core with a second active element doping concentration distribution different than the first active element doping concentration distribution
Implementation Method 3
a first pumping light source operable to generate first pumping light and allow the first pumping light to enter the first cladding layer of the first amplification optical fiber
Data Source
AI summary
An optical amplification apparatus includes a first amplification optical fiber, a second amplification optical fiber, a first pumping light source, and a second pumping light source. The first amplification optical fiber includes a first core and a first cladding layer. The first core is doped with an active element using a first active element doping concentration distribution. The first cladding layer is disposed out of the first core and has a refractive index lower than the refractive index of the first core. The second amplification optical fiber is connected to the first amplification optical fiber in a longitudinal direction of the first amplification optical fiber. The second amplification optical fiber includes a second core and a second cladding layer. The second core is doped with active element using a second active element doping concentration distribution that is different from the first active element doping concentration distribution.