Gas Laser Resonator Buffer Chamber Pressure Gradient
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Solution Overview
Problem
Existing gas laser resonators face issues with deterioration in plasma discharge quality due to pressure changes and inflow of impurity gases caused by leakage, which affects the longevity and performance of the laser machining apparatus.
Innovation Solution
Incorporating a buffer chamber with a vacuum pressure and a larger volume than the discharge chamber, sealed by fewer gaskets, to create a pressure difference that reduces leakage and impurity gas inflow, thereby maintaining the discharge chamber's gas quality over a longer period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pair of facing electrodes is arranged within an airtight container with sealed laser medium gas, then plasma discharge can be generated for laser generation, but pressure changes and impurity gas inflow occur over time due to gasket leakage
Solution Approach 1:
The resonator is divided into two separate chambers: a discharge chamber containing the laser medium gas and electrodes, and a buffer chamber containing inert gas. This segmentation isolates the critical discharge chamber from direct exposure to external pressure changes and leakage, as the buffer chamber absorbs pressure variations and prevents impurity gases from reaching the discharge chamber.
Solution Approach 2:
The buffer chamber acts as an intermediary between the external environment and the discharge chamber. It serves as a protective barrier that absorbs pressure changes and prevents direct leakage into the discharge chamber, thereby maintaining plasma discharge quality over extended operational periods.
2Reliability
If multiple gaskets are used to seal the discharge chamber, then hermetic sealing is achieved, but leakage still occurs over time causing pressure change and impurity inflow
Solution Approach 1:
The buffer chamber is pre-filled with inert gas at a different pressure than the discharge chamber. This pre-established pressure differential acts as a cushion that prevents external impurity gases from reaching the discharge chamber even when gasket leakage occurs, thereby extending the time before quality deterioration occurs.
3Reliability
If the discharge chamber is sealed hermetically with laser medium gas at reduced pressure, then plasma discharge can be maintained, but pressure changes over time due to leakage affect discharge quality
Solution Approach 1:
By segmenting the resonator into discharge and buffer chambers, the pressure instability caused by leakage is isolated to the buffer chamber. The discharge chamber maintains stable pressure because any leakage is absorbed by the buffer chamber's larger volume and different pressure conditions, preventing composition changes in the laser medium gas.
4Device complexity
If no buffer chamber is provided, then the structure is simpler, but pressure changes and impurity gas inflow directly affect the discharge chamber
Solution Approach 1:
The buffer chamber is filled with inert gas that creates a protective atmosphere, preventing external impurity gases from reaching the discharge chamber. This inert environment maintains discharge quality over time while adding minimal structural complexity, as the buffer chamber simply requires additional sealing surfaces.
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 significantly extends the operational life of the gas laser resonator by maintaining the discharge chamber's gas quality, reducing pressure changes and impurity gas inflow, allowing for enhanced laser machining quality without the need for frequent gas exchanges or detection systems.
Implementation Method 1
The discharge chamber and the buffer chamber are sealed so that a pressure difference between the chambers can be obtained
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention aims to prevent, in a gas laser resonator, the deterioration of the quality of discharges produced by reduction of the pressure in the discharge chamber (2) as well as the inflow of impurity gases, such as air, into the discharge chamber (2). This is produced by providing a buffer chamber (12), different from the discharge chamber (2). A bracket (6) is attached to one end of a tube (1) comprising the discharge chamber interposing a sealing part, e.g. a gasket, (13) only for sealing the opening of the discharge chamber (2) and a gasket (14) for sealing both openings of the discharge chamber (2) and the buffer chamber (12). A glass plate (8) and a further bracket (9) are attached to the other end of the tube (1) interposing a gasket (15) only for sealing the opening of the discharge chamber (2) and a gasket (16) for sealing both openings of the discharge chamber (2) and the buffer chamber (12). The pressure in the buffer chamber (12) is set lower than the one of the discharge chamber (2) and than the atmospheric pressure so that to decrease the inflow of the impurity gases toward the discharge chamber (2).