Gas Laser Anode Coating Profile to Prevent Peeling and Discharge Spread
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Solution Overview
Problem
In gas laser devices used for semiconductor exposure, chromatic aberration occurs due to the large spectral line width of KrF and ArF excimer laser devices, leading to decreased resolution. This is exacerbated by the deterioration of anode electrode base members over time, which can lead to instability in laser light generation.
Innovation Solution
The use of discharge electrodes with a specifically designed anode that includes a metal electrode base member and a coating layer with varying thicknesses along its side surface. The coating layer has a first portion coating a first region of the side surface and a second portion coating a second region, located farther from the cathode, which is thicker than the first portion. This design helps maintain the integrity of the anode and suppresses peeling of the coating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a coating layer is formed on the side surface of the anode to prevent deterioration, then the anode durability is improved, but the coating layer may peel off due to thermal stress and electrostatic force, reducing reliability
Solution Approach 1:
The coating layer is designed with varying thickness along the side surface of the anode, being thicker at the lower end (farther from cathode) and thinner at the upper end (closer to cathode). This local variation in coating quality optimizes the balance between preventing deterioration and resisting peeling forces throughout the anode structure.
Solution Approach 2:
The thickness parameter of the coating layer is changed along the longitudinal direction of the anode. By making the coating thickness a variable parameter rather than constant, the design adapts to the varying stress distribution, with thicker coating where deterioration risk is higher and thinner coating where peeling force is greater.
2Measurement precision
If the spectral line width is narrowed using a line narrowing module to reduce chromatic aberration, then the resolution is improved, but the device complexity increases due to additional optical components
Solution Approach 1:
The line narrowing function is extracted from the main laser resonator body and implemented as a separate, integrable module. This allows the resolution improvement functionality to be added without fundamentally redesigning the entire laser system, managing complexity through modular extraction of the spectral narrowing capability.
3Loss of substance
If the anode electrode base member is made thinner to reduce material usage, then the manufacturing cost is reduced, but the anode strength decreases making it susceptible to deterioration
Solution Approach 1:
The anode is constructed as a composite structure combining a metal electrode base member with an insulating material coating layer. This composite design allows the base member to be thinner (reducing material usage) while the coating layer provides additional protective function, maintaining overall strength and deterioration resistance through material composition rather than sheer thickness.
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 suppresses the increase in discharge width, maintains the structural integrity of the anode, and prevents peeling of the coating layer, thereby stabilizing laser light generation and improving resolution in gas laser devices.
Implementation Method 1
discharge electrodes to be used in a gas laser device for exciting a laser gas containing fluorine by discharge
Implementation Method 2
exciting a laser gas containing fluorine by discharge and outputting laser light
Data Source
AI summary
Discharge electrodes to be used in a gas laser device for exciting a laser gas containing fluorine by discharge include a cathode and an anode. The anode is arranged as facing the cathode and includes an electrode base member including a metal, and a coating layer including an insulating material and coating a part of a side surface, parallel to a longitudinal direction, of the electrode base member. The coating layer includes a first portion coating a first region of the side surface and a second portion coating a second region of the side surface, located farther from the cathode than the first region in a discharge direction perpendicular to the longitudinal direction, and being thicker than the first portion.