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Nanoparticles of NiS (amorphous α and crystalline β phases), Ni3S2 and Ni were obtained by passing H2S through a solution of NiSO4•7H2O followed by drying or annealing of washed precipitate in hydrogen or nitrogen atmospheres. The synthesized materials were mixed with a polymer (polydimethylsiloxane elastomer) and applied to the surface of chemically prepared conical constrictions on SMF-28 fiber. Passive Q-switches were integrated into a specially designed erbium ring fiber laser and tested.doi:10.1088/1742-6596/1851/1/012018 fatcat:dixo54w52vgq3nlc32savzjyr4