Laser Chamber Electrode Geometry for Lower Fluorine Wear
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Solution Overview
Problem
The high consumption of fluorine-containing laser gas leads to rapid wear of the main electrodes in gas laser apparatuses, reducing the service life of the laser chamber and affecting the stability of the laser beam output.
Innovation Solution
The design of asymmetrical and symmetrical cross-sectional shapes for the cathode and anode discharge surfaces of the main electrodes, respectively, mimicking the wear patterns observed at the end of the electrode's life, to minimize fluorine consumption and electrode wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional symmetrical electrode design is used, then manufacturing is simple, but fluorine consumption is high and electrode wear is rapid
Solution Approach 1:
The invention applies asymmetry by designing the cathode discharge surface with an asymmetric cross-sectional shape that differs from the symmetric anode discharge surface. Specifically, the cathode has a flattened shape on the upstream side and a curved shape on the downstream side, while the anode maintains a symmetric curved shape. This asymmetric configuration optimizes the discharge plasma distribution and reduces fluorine consumption, thereby extending electrode service life.
Solution Approach 2:
The invention applies local quality by creating different surface geometries at different locations of the cathode discharge surface. The upstream side has a flattened local geometry while the downstream side has a curved local geometry, allowing each region to optimize plasma interaction and reduce localized fluorine consumption that would otherwise lead to rapid electrode wear.
2Duration of action of stationary object
If conventional symmetrical electrode design is used, then manufacturing is simple, but electrode wear is rapid
Solution Approach 1:
The asymmetric cross-sectional shape of the cathode discharge surface, with flattened upstream and curved downstream portions, distributes electrical discharge and plasma formation more evenly across the electrode surface. This reduces concentrated stress and thermal loading at specific points, thereby improving electrode durability and extending service life.
Solution Approach 2:
By providing different local geometries (flattened vs. curved) at different portions of the cathode, the invention creates optimized local discharge characteristics that reduce localized electrode degradation, enhancing overall electrode durability.
3Reliability
If conventional electrode design is used, then initial manufacturing is easier, but pulse energy output becomes unstable over time
Solution Approach 1:
The asymmetric cathode design with flattened upstream and curved downstream portions creates more stable plasma discharge characteristics throughout the electrode's operational life. This stability prevents pulse energy output degradation over time, maintaining reliable laser beam output despite the increased manufacturing complexity.
Solution Approach 2:
The localized geometric variations on the cathode surface optimize plasma interaction at different discharge regions, ensuring consistent energy distribution and stable pulse energy output throughout the electrode's service life.
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 design extends the service life of the laser chamber by reducing fluorine consumption and maintaining consistent pulse energy output, thereby improving the operational stability of the gas laser apparatus.
Implementation Method 1
a fan configured to circulate the laser gas so as to pass through a discharge space between the cathode electrode and the anode electrode
Implementation Method 2
a preionization electrode disposed on an upstream side of the laser gas relative to the cathode electrode and the anode electrode
Implementation Method 3
excites a laser gas containing fluorine by electric discharge
Implementation Method 4
excites a laser gas containing fluorine by electric discharge
Implementation Method 5
a gas laser apparatus that excites a laser gas containing fluorine by electric discharge
Data Source
AI summary
A laser chamber includes a cathode electrode including a cathode discharge surface extending in a first direction, an anode electrode including an anode discharge surface extending in the first direction, the anode discharge surface facing the cathode discharge surface in a second direction orthogonal to the first direction, a fan that circulates the laser gas to pass through a discharge space between the cathode electrode and the anode electrode in a third direction orthogonal to the first direction and the second direction, and a preionization electrode disposed on an upstream side of the laser gas. A cross-sectional shape of the cathode discharge surface cut along a plane orthogonal to the first direction is asymmetrical about an axis parallel to the second direction, and a cross-sectional shape of the anode discharge surface cut along the plane is symmetrical about the axis, in an initial state.