Monolithic Ceramic Slab Laser Design for High Power Output
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Solution Overview
Problem
Conventional carbon dioxide lasers face challenges with complex designs, hotspots at electrical feed-throughs, and difficulties in achieving high power output due to the complexity of ceramic grinding and multiple mirrors required for folded laser cavities.
Innovation Solution
A monolithic ceramic core slab laser design with external electrodes and mirrors forming a free-space or waveguide resonator, eliminating internal RF feed-throughs and using a ceramic body with Alumina or other materials to maintain an airtight enclosure and reduce thermal issues, while optimizing beam overlap and resonator configuration for higher power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminum electrodes and vacuum enclosure are used in conventional CO2 laser design, then electrical connection and plasma confinement are achieved, but the structure becomes complicated and thermal issues arise at feed-throughs
Solution Approach 1:
The patent extracts the electrodes from the vacuum enclosure, placing them externally on the ceramic body surface. This eliminates the need for RF feed-throughs and internal vacuum sealing for electrical connections, thereby reducing structural complexity while maintaining reliable electrical connection for plasma generation
Solution Approach 2:
The ceramic body serves as an intermediary between the external electrodes and the laser gas plasma. It provides the vacuum enclosure function while allowing external electrical connection, mediating between the electrical input and the optical output without requiring complex internal feed-through structures
2Power
If multiple folded beam paths are used to increase gain length, then higher power output is achieved, but ceramic grinding complexity and mirror requirements increase
Solution Approach 1:
The patent segments the laser cavity into multiple discrete mirrors arranged in a folded configuration within the ceramic enclosure. This allows the beam to traverse multiple paths for increased gain length while keeping each ceramic component relatively simple, avoiding the need for complex monolithic ceramic grinding
Solution Approach 2:
The patent uses a folded resonator configuration that exploits three-dimensional space within the ceramic enclosure. By folding the beam path in multiple dimensions rather than using a single long linear path, the effective gain length is increased without requiring proportionally larger or more complex ceramic components
3Use of energy by moving object
If RF feed-throughs are used to provide power to plasma, then electrical connection is maintained, but thermal stress and reliability issues occur due to skin effect heating
Solution Approach 1:
The patent extracts the electrodes from the vacuum enclosure and places them externally on the ceramic body. This eliminates the RF feed-throughs entirely, removing the source of skin effect heating and thermal stress while maintaining the ability to transmit RF power to generate and sustain the plasma discharge
Solution Approach 2:
The patent replaces the mechanical/electrical feed-through system with an external electrode configuration coupled to the laser cavity through the ceramic body. This substitution eliminates the thermal issues associated with RF feed-throughs while maintaining effective power coupling to the plasma
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 enhances the reliability and power output of carbon dioxide lasers by simplifying the structure, reducing thermal stress, and improving beam quality through efficient heat management and resonator configuration, leading to increased gain length and stability.
Implementation Method 1
a laser gas disposed in the laser cavity is excited when an excitation signal is applied to the first and second electrodes
Implementation Method 2
the first and second walls and the first and second mirrors defining a slab laser cavity within the ceramic body... a laser gas disposed in the laser cavity is excited when an excitation signal is applied
Implementation Method 3
a ceramic bore which acts as an optical waveguide and/or a free space propagation path for the laser radiation
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A laser (10) may comprise a ceramic body (12) including a first wall (32) and a second wall (32) opposite the first wall (32), a first mirror (16) positioned at first ends of the first and second walls (32), a second mirror (18) positioned at second ends of the first and second walls (32) opposite the first ends, the first and second walls (32) and the first and second mirrors (16, 18) defining a slab laser cavity (14) within the ceramic body (12). The laser (10) may further comprise a first electrode (24) positioned outside the laser cavity (14) and adjacent to the first wall (32) of the ceramic body (12) and a second electrode (26) positioned outside the laser cavity (14) and adjacent to the second wall (32) of the ceramic body (12), wherein a laser gas disposed in the laser cavity (14) is excited when an excitation signal is applied to the first and second electrodes (24, 26).