Double-Ended Laser Amplifier Pump Splitting to Prevent End-Cap Damage
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Solution Overview
Problem
Existing laser amplifiers face challenges in efficiently amplifying seed light while minimizing damage to pump lasers and end caps due to unabsorbed excitation light, and in setting the optimal light amounts incident on the laser amplification medium.
Innovation Solution
A double-ended excitation laser amplifier system that utilizes λ/4 and λ/2 wavelength plates and polarizing beam splitters to adjust the polarization state of excitation light, allowing for precise control of light amounts and direction, thereby minimizing unabsorbed excitation light and reducing damage to pump lasers and end caps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If unabsorbed excitation light is allowed to reach pump lasers and end caps, then the laser amplification process can proceed, but damage occurs to pump lasers and end caps
Solution Approach 1:
The harmful unabsorbed excitation light is extracted from the optical path using a polarizing beam splitter, which separates the polarized excitation light from the optical path before it can reach and damage the pump lasers and end caps
Solution Approach 2:
A polarizing beam splitter acts as an intermediary element that selectively transmits or reflects light based on polarization state, allowing controlled distribution of excitation light to both ends of the amplification medium while protecting sensitive components
2Productivity
If light amount incident on laser amplification medium is not precisely controlled, then the system structure can be simpler, but amplification efficiency decreases and damage risk increases
Solution Approach 1:
The system uses polarizing beam splitters and wavelength plates that can dynamically control the distribution of excitation light to both ends of the amplification medium, allowing precise adjustment of light amounts incident on each end based on operational requirements
Solution Approach 2:
The invention changes the polarization state of excitation light using wavelength plates and controls the splitting ratio through polarizing beam splitters, thereby precisely controlling the light amount parameters incident on the laser amplification medium
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 system effectively amplifies seed light with high energy output while preventing damage to pump lasers and end caps, ensuring efficient and controlled light distribution within the laser amplification medium.
Implementation Method 1
a first λ/4 wavelength plate and a first λ/2 wavelength plate through which the excitation light is transmitted
Implementation Method 2
a first polarizing beam splitter configured to separate the excitation light transmitted through the first λ/4 wavelength plate and the first λ/2 wavelength plate into first light having a first polarization direction and second light having a second polarization direction
Implementation Method 3
a laser amplification medium configured to amplify pulsed seed light
Data Source
AI summary
A double-ended excitation laser amplifier includes a laser amplification medium configured to amplify pulsed seed light, an excitation light source configured to output excitation light, a first λ/4 wavelength plate and a first λ/2 wavelength plate through which the excitation light is transmitted, a first polarizing beam splitter configured to separate the excitation light transmitted through the first λ/4 wavelength plate and the first λ/2 wavelength plate into first light having a first polarization direction and second light having a second polarization direction, a first incident optical system configured to cause the first light to be incident on a first end of the laser amplification medium, and a second incident optical system configured to cause the second light to be incident on a second end of the laser amplification medium.