Abstract: The dependencies of linear losses coefficient $alpha@, two-photon absorption constant $beta@, optical damage threshold I$-p$/ and pseudogap width E$-0$/ on structure and concentration changes of glasses from the glass-forming region of Ge-As-S system along the As-GeS$-2$/, As-Ge$-2$/S$-3$/, As$-2$/S$-3$/-GeS$-2$/ and As$-2$/S$-3$/-Ge$-2$/S$-3$/ sections have been experimentally studied. The critical values of concentration and average coordination number at which the $alpha@, $beta@, and I$-p$/ reach their extremes were determined. These results have been discussed in terms of phase and structure-topological transitions. !6
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