An iodine source for a chemical oxygen iodine laser (COIL) system (40, 50) is described. The iodine source is a combination of iodine monochloride and molecular iodine. The iodine monochloride and molecular iodine may be injected either simultaneously or sequentially through separate manifold/conduit assemblies (30, 102) into the mixing nozzle (22), or they may be combined together into a single gaseous feed stream. The iodine monochloride may be dissociated prior to being injected into the mixing nozzle (22) or, alternatively, the dissociated iodine monochloride may be combined with the molecular iodine feed stream in order to initiate the atomic iodine/molecular iodine chain reaction prior to injection into the mixing nozzle (22).
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