Polyimide Condenser for Gas Laser Stability
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Solution Overview
Problem
Gas laser devices face instability in pulsed laser beam performance due to high pulse voltage and repetition frequency, leading to unstable pulse energy, waveform, and spectral width, primarily attributed to the temperature-dependent dielectric constant of ceramics used in peaking condensers, which increases energy loss and reduces capacitance.
Innovation Solution
Employing a polyimide condenser with a polyimide dielectric instead of ceramics to supply power to the discharge electrodes, reducing energy loss, stabilizing capacitance, and enhancing heat resistance, thereby maintaining consistent performance at high repetition frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a peaking condenser with a ceramics dielectric is used to supply power at high pulse voltage and repetition frequency, then the laser device can operate at high repetition frequency, but the temperature-dependent dielectric constant causes unstable pulse energy, waveform, and spectral width
Solution Approach 1:
The patent changes the material parameter of the dielectric from ceramics to polyimide. This material substitution fundamentally alters the temperature-dependent dielectric constant characteristic, enabling stable capacitance values across a wide temperature range while maintaining high repetition frequency operation. The polyimide dielectric's inherent thermal stability resolves the contradiction between high productivity and reliability.
2Power
If a peaking condenser with ceramics dielectric is used, then power can be supplied to discharge electrodes, but energy loss increases and capacitance decreases due to temperature dependence
Solution Approach 1:
The patent changes the dielectric material from ceramics to polyimide, which fundamentally alters the energy loss characteristics. The polyimide dielectric exhibits lower and more stable loss tangent values across the operating temperature range, reducing energy dissipation in the condenser while maintaining effective power supply capability to the discharge electrodes.
3Stress or pressure
If ceramics dielectric is used in the condenser, then the condenser can function at high voltage, but the dielectric withstanding voltage decreases due to temperature increase
Solution Approach 1:
The patent changes the dielectric material from ceramics to polyimide, which possesses superior thermal stability and maintains its dielectric withstanding voltage characteristics across a wide temperature range. The polyimide's molecular structure provides inherent resistance to thermal degradation, ensuring stable high-voltage performance even at elevated operating temperatures.
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 polyimide condenser stabilizes the pulse voltage and spectral width of the pulsed laser beam, improves discharge efficiency, and maintains performance over a wider temperature range, reducing energy loss and increasing dielectric withstanding voltage.
Implementation Method 1
a condenser including a polyimide dielectric and configured to supply power to between the first discharge electrode and the second discharge electrode
Implementation Method 2
a condenser including a polyimide dielectric and configured to supply power to between the first discharge electrode and the second discharge electrode
Implementation Method 3
increasing dielectric withstanding voltage
Data Source
AI summary
A gas laser device may include: a laser chamber containing laser gas; a first discharge electrode disposed in the laser chamber; a second discharge electrode disposed to face the first discharge electrode in the laser chamber; and a condenser including a polyimide dielectric and configured to supply power to between the first discharge electrode and the second discharge electrode.