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Er 3+ -doped As 2 S 3  glasses were synthesized using As, S and Er 2 S 3  as raw materials. In order to produce glasses with high mechanical properties along with high solubility of rare earth ions in these glasses, different media such as water, hydraulics and heat-resistant oil were selected for quenching specimens. Heat-resistant oil was selected as optimized medium. The effects of Er content (0.5–2 wt%) on transmission, mechanical and structural properties of the glasses were investigated. By increasing Er content in the base glass, some clusters were introduced to glass field which causes reduction in transmission in infrared (from 70 to 25%) and visible ranges (from 70 to 60%). Density and microhardness of samples were increased from 2.78 to 3.26 g/cm 3  and 81.5 to 91.75 Mpa, respectively, by increasing Er content.

The effect of Er on optical and mechanical properties of As2S3 glasses quenched in different media