Abstract
Two types of gas lasers, the helium-neon and the sealed-off, waveguide carbon dioxide, are discussed. Prior to hard seals in helium-neon lasers, failures due to contamination of the gas mixture had far outnumbered optical failures. Now that hard seals have been established, the failure rate constant associated with the lasing medium has been reduced below the failure rate constant associated with the optics. To accomplish the corresponding reduction in failures associated with the lasing medium of sealed-off, waveguide carbon dioxide lasers, it will be necessary not only to establish true hard seals but also to prevent a general dissociation of carbon dioxide by catalyzing the reverse reaction.
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