The influence of electrode on laser gas stability of the CO laser by several kinds of metal materials is investigated. These materials are aluminum, phosphorus copper, OFHC copper, silver copper, stainless steel, nickel, and tantalum. From the analysis of the adhesion on the surface of the electrode after discharge, we get the information about the surface variation, and this can be the basis according to which we can select suitable electrode material. We find that tantalum is a relatively good electrode material for the CO laser.
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