Abstract
A general view on the plasma chemistry of lasers, which primarily includes the changes of CO 2, CO and O 2 species, and the corresponding influence on the operation of the sealed transversely excited atmospheric (TEA) CO 2 laser, utilizing a corona discharge preionized system, has been given. Decomposition process of CO 2, especially in the case of standard CO 2/N 2/He gas mixture, was observed. The addition of H 2 as well as CO/H 2 gases extends the total number of stable discharge pulses in the system. Hydrogen improves the plasma stability and the output energy, while carbon monoxide significantly reduces decomposition of CO 2. The CO 2/N 2/He(/CO/H 2) has shown itself as the most convenient gas mixture of achieving long-life operation. An increase of CO 2 concentration in this mixture, when the initial content of CO was 10% has been recorded.
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