Vol. 37, issue 04, article # 6

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.

Keywords:

optical breakdown, ZnGeP2, nonlinear crystal, diffusion doping, impurity atom, thermal diffusion

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