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Proceedings Paper

Spectroscopic characterization of Cr2+ ions in ZnSe/ZnS crystals under visible excitation
Author(s): Jeremy M. Peppers; Vladimir V. Fedorov; Sergey B. Mirov
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Paper 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.

Paper Details

Date Published: 26 March 2015
PDF: 6 pages
Proc. SPIE 9342, Solid State Lasers XXIV: Technology and Devices, 934225 (26 March 2015); doi: 10.1117/12.2180289
Show Author Affiliations
Jeremy M. Peppers, The Univ. of Alabama at Birmingham (United States)
Vladimir V. Fedorov, The Univ. of Alabama at Birmingham (United States)
Sergey B. Mirov, The Univ. of Alabama at Birmingham (United States)

Published in SPIE Proceedings Vol. 9342:
Solid State Lasers XXIV: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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