Abstract: enrichment by laser isotope separation uses a three step operation which requires four visible wavelengths to boost an individual U$+235$/ isotope from a low lying atomic energy level to an autoionizing state. The visible wavelengths are delivered by dye lasers pumped by copper vapor lasers (CVL). In this particular talk, a single dye chain consisting of a master oscillator and amplifier stages will be described and some of its performance given.!0
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