Auxiliary Electrode Raised Portions Protect CO2 Laser Mirrors
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Solution Overview
Problem
High-power CO2 slab lasers face damage to resonator mirrors due to particulates ablated from ceramic spacers under high laser power, which existing protection methods do not adequately address, leading to reduced performance and lifetime.
Innovation Solution
The introduction of auxiliary electrodes with raised portions, electrically connected to the ground electrode, minimizes erosion of insulating spacer strips by laser radiation and protects the mirrors from particulate damage by strategically positioning them to deflect stray radiation and prevent ablation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high laser power is used to increase output, then productivity is improved, but ceramic spacers are ablated generating particles that damage mirrors reducing reliability
Solution Approach 1:
A magnetic field is introduced as an intermediary between the ceramic spacers and the laser radiation. The magnetic field interacts with the ablated particles to deflect them away from the mirrors, preventing particle deposition and mirror damage while allowing the high-power laser to operate without compromising reliability
Solution Approach 2:
The patent changes the physical state and trajectory of ablated particles by applying a magnetic field. This alters the path of particles generated at high laser power, directing them away from sensitive mirror surfaces and preventing the harmful deposition that would otherwise occur
2Device complexity
If ceramic spacers are used to maintain electrode separation, then device structure is simplified, but spacers erode under high power generating harmful particles
Solution Approach 1:
The magnetic field serves as a mediator that intercepts and redirects ablated particles from the ceramic spacers before they can reach the mirrors. This protects the mirrors from particle damage while maintaining the simple ceramic spacer structure for electrode support
Solution Approach 2:
The patent converts the harmful effect of particle ablation into a beneficial outcome by using the magnetic field to redirect these particles away from mirrors. The ablation process continues to occur, but the particles are now directed toward safe paths that do not compromise mirror integrity
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 configuration effectively reduces the erosion of ceramic spacers and subsequent particulate deposition on mirrors, enhancing the reliability and longevity of high-power CO2 slab lasers by preventing damage from stray laser radiation.
Implementation Method 1
laser radiation circulates in the laser resonator
Implementation Method 2
the ends of the ceramic spacers can be ablated by stray laser radiation
Data Source
AI summary
A CO2 gas discharge laser includes elongated planar live and ground electrodes vertically spaced and electrically insulated from each. The electrodes are spaced apart by ceramic spacer strips arranged along the edges of the electrodes. An auxiliary electrode is located at each end of the live electrode, co-planar with the live electrode, longitudinally spaced part from the live electrode vertically spaced apart from, but electrically connected to, the ground electrode. The auxiliary electrode has two raised portions spaced apart by a distance less than the distance between inside edges of the ceramic strips. The raised portions of the auxiliary electrode prevent erosion of the ceramic strips by laser radiation generated in the resonator when the laser is operating.