The method of atomic force microscopy explores a roughness of a surface of the silica glass cooled with different velocity from temperature 2300 °C. It is compared two modes of cooling of a glass rods with a diameter of 16mm: convective heat exchange with the surrounding air and quenching with dropping the sample into a vessel with water. The roughness of a surface of a silica glass in the second mode of cooling was essentially less that can promote magnification of its strength. The results of

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... these studies may turn out to be promising in terms of increasing the strength and reliability of silica optical fibers used in laser surgery.