Comparison of Microscopic Mechanisms of Blue Anti-Stokes Luminescence in Undoped and Chromium Doped ZnSe Crystals
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Anti-Stokes luminescence is observed in chromium doped and in undoped ZnSe crystals. In the former case anti-Stokes luminescence is due to two complementary ionization transitions of Cr ions. In the latter case two-photon absorption becomes important at a high excitation density.
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