Intense 2.9 μm mid-infrared emission from Dy3+/Yb3+: SrF2 crystal under 975 nm excitation

초록

The intense 2.9 mu m MIR (mid-infrared) luminescence corresponding to the Dy3+: H-6(13/2 )-> H-6(15/2) transition was achieved for the first time in Dy3+/Yb3+ ions co-doped SrF2 crystals. 2 at% Dy3+: SrF2, 2 at% Dy3+/5 at% Yb3+: SrF2, and 5 at% Yb3+: SrF2 crystals were grown by Bridgman method. The influence of Yb3+ on its spectral properties and energy transfer mechanisms has been studied. In comparison to Dy3+ doped SrF2 crystals, Dy3+/Yb3+ co-doped crystals exhibit not only intense 2.9 mu m emission but also longer high laser energy level lifetimes, favoring 2.9 mu m population inversion and lasing behavior. Furthermore, the ET efficiency from Yb3+ to Dy3+ in Dy3+/Yb3+ co-doped crystals is found to be as high as 95.34%, indicating that the ET from Yb3+ is efficient. The results show that incorporating Yb3+ into Dy3+: SrF2 crystals improves the ability to achieve 2.9 mu m lasing action, which could be used as a potential gain media for laser diode-pumped MIR lasers. (C) 2022 Elsevier B.V. All rights reserved.

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