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the active medium of lasers consists of a host material (gas, liquid or solid) containing an active species, osake, millest koosneb laseri aktiivkeha
active species . Keemiaterminite baas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kem/active%20species/1/eng (05.07.2026)
