Abstract

This paper proposes a new method of determining the refractive-index nonlinearity coefficient n2 of glasses, based on the direct observation of the self-action of a powerful probe beam in a nonlinear medium. It is shown that the new KGSS-0180/35 phosphate laser glass possesses a nonlinearity coefficient n2 almost a factor of 2 less than that of GLS-22 phosphate glass, which is widely used in domestically produced laser installations. The new glass also has a lower n2 value than that of standard K8 optical glass, but somewhat greater than that of fused quartz.

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