Gas Laser Chamber Layout for Uniform Preliminary Ionization
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Solution Overview
Problem
Gas laser apparatuses face issues with unstable primary discharge and decreased laser light stability due to nonuniform preliminary ionization intensity, leading to unreliable performance in electronic device manufacturing.
Innovation Solution
The chamber design incorporates two preliminary ionization electrodes with inclined dielectric pipes and outer electrodes, optimizing the distance and angle of their end portions to ensure uniform preliminary ionization intensity, reducing unstable primary discharge and enhancing laser light stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preliminary ionization electrodes are provided close to primary electrodes to ensure sufficient preliminary ionization, then preliminary ionization intensity increases, but nonuniformity in ionization intensity increases causing unstable primary discharge
Solution Approach 1:
The dielectric pipes of the preliminary ionization electrodes are inclined relative to the optical axis, creating asymmetric positioning. The inner electrodes extend along the inclined dielectric pipes, and the outer electrodes are positioned to face the dielectric pipes at inclined angles. This asymmetric configuration causes the distance from the optical axis to the end portions of the electrodes to vary, producing a gradient in preliminary ionization intensity that stabilizes primary discharge while maintaining overall uniformity across the discharge region.
Solution Approach 2:
The patent applies different spatial characteristics to different regions of the preliminary ionization electrode structure. The inclined configuration creates localized variations in ionization intensity distribution, with closer regions providing higher ionization and farther regions providing lower ionization. This local quality variation compensates for potential nonuniformities and achieves stable overall ionization across the entire discharge region.
2Stability of the object's composition
If preliminary ionization electrodes are positioned at optimal distances to achieve uniform ionization intensity, then ionization uniformity improves, but preliminary ionization intensity may be insufficient for stable primary discharge
Solution Approach 1:
The patent modifies the geometric parameters of the preliminary ionization electrode system by introducing inclination angles for the dielectric pipes and electrode end portions. This parameter change transforms the distance distribution from uniform to graduated, with end portions at different distances from the optical axis. This parameter modification enables the system to achieve both sufficient overall ionization intensity and uniform spatial distribution, resolving the contradiction between intensity and uniformity.
3Shape
If the distance from optical axis to electrode end portions is uniform, then structural symmetry is maintained, but preliminary ionization intensity becomes nonuniform causing discharge instability
Solution Approach 1:
The patent deliberately breaks the symmetric configuration by inclining the dielectric pipes and positioning the electrode end portions at different distances from the optical axis. This asymmetric design creates a graduated distance distribution that produces uniform preliminary ionization intensity across the discharge region, thereby stabilizing primary discharge and improving laser light stability while maintaining functional symmetry in terms of ionization coverage.
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 suppresses nonuniformity in preliminary ionization intensity, stabilizing the energy output of the gas laser apparatus and improving the reliability of the electronic device manufacturing process.
Implementation Method 1
When a voltage is applied between the inner electrode and the outer electrode, corona discharge occurs in a region around the dielectric pipe and the end portion of the outer electrode, and ultraviolet light is emitted.
Implementation Method 2
The ultraviolet light from the preliminary ionization electrodes preliminarily ionizes the laser gas in the chamber.
Implementation Method 3
first and second primary electrodes that are provided in the internal space, each have a longitudinal direction along a predetermined direction, face each other with a gap therebetween, and cause the laser gas to generate light by using a voltage applied to the electrodes
Data Source
AI summary
In a chamber of a gas laser apparatus, a distance from an imaginary axis extending along a predetermined direction to a first end portion between first and second primary electrodes increases from one side toward the other side in the predetermined direction, and a distance from the imaginary axis to a second end portion decreases from the one side toward the other side in the predetermined direction.