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Uniform Field Electrodes for High-Power and High-Repetition TEA-CO2 Lasers

A new electrode system has been specially developed for high-power and high-repetition transversely excited atmospheric (TEA)-CO2 lasers. The new system produces a uniform glow discharge compared that in a conventional Chang electrode system. In this new system, the laser beam energy profile shows a nearly flat top configuration and the repetitive rate of maximum output power has been increased from 175 Hz to 350 Hz. The discharge energy density profile is calculated to estimate the influence of gas density fluctuation. The numerical result shows that the maximum fluctuation of gas density is 10% less in this electrode system.