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Polycrystalline zinc sulfide (ZnS) samples obtained by chemical vapour deposition were doped with Cr2+ ions using hot isostatic pressing (at 100 MPa/1250 °C). Their structure was studied by means of… Click to show full abstract
Polycrystalline zinc sulfide (ZnS) samples obtained by chemical vapour deposition were doped with Cr2+ ions using hot isostatic pressing (at 100 MPa/1250 °C). Their structure was studied by means of x-ray diffraction, SEM and Raman spectroscopy. The Cr2+:ZnS samples exhibited excellent transparency in the near-IR. Absorption saturation of Cr2+:ZnS is demonstrated at 1.54 µm (5T2(5D) → 5E(5D) transition of Cr2+ ions in tetrahedral sites) for ns-long pulses yielding a saturation fluence of 0.16 ± 0.03 J cm−2. The laser-induced damage threshold is 6.0 ± 0.5 J cm−2. The synthesized polycrystalline Cr2+:ZnS is promising for passive Q-switching of erbium lasers emitting at 1.5–1.7 µm.
Journal Title: Laser Physics Letters
Year Published: 2019
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