Effect of diffusion doping of ZnGeP2 with Mg and Ca atoms on the optical properties of single crystals
E.S. Slyunko1,2, N.N. Yudin3,1,2, V.M. Kalygina1, A.I. Knyazkova3, M.S. Snegerev1, M.M. Zinovev3,1,2, V.S. Kuznetsov1,4,2, S.N. Podzyvalov1,2, A.B. Lysenko1,2, A.Yu. Kalsin1,2, A.Sh. Gabdrakhmanov1,2
1Tomsk State University, Tomsk, Russia
2LLC "Optical Crystal Laboratory", Tomsk, Russia
3V.E. Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
4Institute of High Current Electronics, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
Keywords: optical breakdown, ZnGeP, nonlinear crystal, diffusion doping, impurity atom, thermal diffusion
Abstract
The influence of Mg and Ca atoms on the optical breakdown threshold of a nonlinear ZnGeP2 crystal at a wavelength of 2.097 mm is studied. An impurity was introduced using diffusion doping; the material was sputtered onto a ZnGeP2 substrate, followed by annealing in vacuum at a temperature of 750 °C for 200 hours. It is shown that the introduction of Mg into a single crystal increases the optical breakdown threshold by 31%. When ZnGeP2 is doped with Ca atoms, the opposite trend is observed. It is suggested that due to the creation of additional channels for energy dissipation of radiative and fast non-radiative relaxation processes through impurity energy levels, the optical breakdown threshold changes, which requires experimental confirmation.
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