Abstract
Continuous melting of phosphate laser glass is being used for the first time to prepare meter-scale amplifier optics for megajoule lasers; a description of the melting process is given. Two key factors in the successful melting of laser glasses are the elimination of damage-causing Pt-inclusions and dehydroxylation of the glass to concentrations less than ∼100 ppmw OH. Oxidizing conditions using 100% O 2 or O 2 + Cl 2 mixtures (at one atmosphere) can be used to dissolve Pt inclusions and the effects of different gases on the dissolution of Pt-inclusions show the trend O 2+Cl 2>O 2≫N 2. The removal of hydroxyl groups is achieved by reactive (O 2 + Cl 2) or non-reactive (O 2) gas bubbling; model calculations are used to simulate this process.
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