Gas Laser Shielding Plate Non-Circular Opening Diffraction
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Solution Overview
Problem
Conventional gas laser devices fail to control self-oscillating light that oscillates along the same optical axis as the pulse laser beam, leading to reduced output power and potential damage to components due to uncontrolled amplification gain consumption.
Innovation Solution
A gas laser device with a discharge electrode and shielding members, including non-circular openings that allow laser beams to pass through, effectively controlling self-oscillating light by diffraction, reducing spontaneous emission light amplification and directing it away from the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional shielding members with circular openings are used, then the structure is simple and easy to manufacture, but self-oscillating light oscillating along the optical axis cannot be controlled, leading to reduced output power and potential component damage
Solution Approach 1:
The patent applies asymmetry by changing the opening shape from circular to non-circular (such as rectangular or elliptical). This asymmetric shape creates directional diffraction effects that prevent self-oscillating light oscillating along the optical axis from forming, while still allowing the laser beam to pass through. The asymmetric geometry disrupts the symmetry required for longitudinal oscillation modes.
Solution Approach 2:
The patent changes the geometric parameters of the opening, specifically transitioning from a circular shape with isotropic diffraction characteristics to a non-circular shape with anisotropic diffraction characteristics. This parameter change in the opening geometry fundamentally alters the diffraction pattern and suppresses the formation of self-oscillating light along the optical axis.
2Productivity
If shielding members are designed with non-circular openings to control self-oscillating light, then output power is enhanced and amplification factor is improved, but manufacturing complexity increases
Solution Approach 1:
The asymmetric non-circular opening design achieves the dual benefit of controlling self-oscillating light and enhancing output power. The asymmetric geometry creates diffraction patterns that suppress longitudinal oscillation modes while maintaining high beam transmission, thereby improving productivity without requiring complex active control systems.
3Object-affected harmful factors
If conventional reflectors and optical absorbers are used to remove self-oscillating light, then light propagated in directions different from the optical axis is controlled, but self-oscillating light oscillating along the same optical axis remains uncontrolled
Solution Approach 1:
The patent applies preliminary action by preventing self-oscillating light from forming in the first place through the non-circular opening design in the shielding member. This proactive approach blocks the formation of longitudinal oscillation modes before they can develop, eliminating the need for subsequent removal mechanisms and providing comprehensive coverage for all oscillation directions.
Solution Approach 2:
The non-circular opening in the shielding member acts as an intermediary element that mediates between the laser cavity and the external environment. It selectively transmits the desired laser beam while blocking the formation of self-oscillating light through diffraction effects, providing universal protection against all oscillation directions without requiring additional components.
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 gas laser device effectively controls self-oscillating light, enhancing the amplification factor and reducing the risk of component damage by redirecting spontaneous emission light, thereby increasing the output power of the pulse laser beam.
Implementation Method 1
including non-circular openings that allow laser beams to pass through, effectively controlling self-oscillating light by diffraction
Data Source
AI summary
A gas laser device includes a shielding plate that is a first shielding member, and a shielding plate that is a second shielding member. The first shielding member includes a first opening, and a second opening. A laser beam that is to be propagated to discharge regions passes through the first opening. The laser beam that has taken a round trip through the discharge regions after passing through the first opening passes through the second opening. The second shielding plate faces the first shielding member the discharge regions located therebetween. The shielding plate includes an opening that is a third opening. The laser beam that has been propagated through the first opening and the discharge regions, and the laser beam that is to be propagated to the second opening through the discharge regions pass through the third opening. A plane shape of the third opening includes a rectilinear segment.