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26 March 2015 Spectroscopic characterization of Cr2+ ions in ZnSe/ZnS crystals under visible excitation
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Abstract
Detailed spectroscopic characterization of Cr:ZnSe (Cr:ZnS) crystals under visible excitation into the charge transfer bands of Cr2+ impurities was performed. Middle infrared photoluminescence of Cr:ZnS under this excitation exhibits shorter rise time (~150ns) than that previously observed in Cr:ZnSe (~4-10 μs). As a result the quantum yield of Cr:ZnS mid-IR photoluminescence under 10ns pulsed 416nm excitation into the charge transfer band was estimated at close to 100%, which contrasts with low (~14%) quantum yield measured in Cr:ZnSe under 532nm pulsed excitation, indicating the possibility of efficient excitation of the upper laser level of Cr:ZnS using this mechanism. The rise time can be caused by cascade relaxation from higher lying levels through the 3T1 metastable level, producing luminescence in the near-IR. Measurements of the temperature dependence of the middle- and near infrared photoluminescence signals are reported. These values indicated that more efficient pumping of Cr:ZnSe under 532nm excitation can be achieved at temperatures greater than 300 K. Results of high temperature laser experiments supporting this idea are presented.
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Jeremy M. Peppers, Vladimir V. Fedorov, and Sergey B. Mirov "Spectroscopic characterization of Cr2+ ions in ZnSe/ZnS crystals under visible excitation", Proc. SPIE 9342, Solid State Lasers XXIV: Technology and Devices, 934225 (26 March 2015); https://doi.org/10.1117/12.2180289
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