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Comparison of Microscopic Mechanisms of Blue Anti-Stokes Luminescence in Undoped and Chromium Doped ZnSe Crystals

100%
Ivanov V., Omel'chuk A., Godlewski M.
Acta Physica Polonica A
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1998
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vol. 94
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issue 3
365-368
EN
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.
2
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Role of Auger-Type Energy Transfer Processes in Quenching of Anti-Stokes Emission in Chromium and Iron Doped ZnSe: ODMR, Optical and Time-Resolved Study

76%
Ivanov V., Karczewski G., Godlewski M., Omel'chuk A., Belyaev A., Zhavoronkov N.
Acta Physica Polonica A
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2003
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vol. 103
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issue 6
695-701
EN
Energy up-conversion in chromium and iron doped ZnSe results in the appearance of an anti-Stokes luminescence. The process is efficient in ZnSe:Cr, but not in ZnSe:Fe. We conclude that very efficient three-center Auger processes in ZnSe:Fe quench the anti-Stokes luminescence emission. For chromium doped samples influence of the Auger mechanism is weaker, which we explain by less efficient carrier retrapping by Cr ions. We further discuss possibility of efficient pumping of infrared Cr-related emissions via Cr photoionization transition.
3
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Optically Pumped Mid-Infrared Stimulated Emission of ZnSe:Cr Crystals

76%
Ivanov V., Godlewski M., Szczerbakow A., Omel'chuk A., Davydov A., Zhavoronkov N., Raciukaitis G.
Acta Physica Polonica A
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2004
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vol. 105
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issue 6
553-558
EN
We demonstrate that ZnSe:Cr is an excellent solid state laser material for mid-infrared region with a broad amplification band from 2.2 μm to 3 μm, and with a high quantum efficiency of a radiative recombination. 46% external total efficiency and 56 mW threshold power were achieved, when pumped with a CW YAlO:Ho laser at resonant excitation conditions. Such laser system can have widespread applications in medicine as laser scalpels with regulated cutting depth. We further demonstrate a stimulated emission under Cr2+ to 1+ photo-ionization pumping. The latter opens chances for laser emission under carrier injection conditions.
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