Journal
OPTICAL MATERIALS
Volume 54, Issue -, Pages 234-237Publisher
ELSEVIER
DOI: 10.1016/j.optmat.2016.02.002
Keywords
Mid-IR laser materials; Cr-Fe energy transfer; Cr,Fe:ZnSe; Thermal diffusion
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Funding
- National Nature Science Founds of China [61378069, 51472257, 51302283]
- Shanghai City Star Program [14QB1400900]
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The spectroscopic characterization and energy transfer mechanism of iron-chromium co-doped ZnSe polycrystalline (Cr,Fe:ZnSe) were reported with dimension of 15 mm x 15 mm x 2 mm obtained by controlled post-growth thermal diffusion method. The infrared absorption is characterized by a strong broad-band centered at 1770 nm which can be attributed to the only spin-allowed transition T-5(2) -> E-5 within the 3d(4) shell of Cr2+ ions. Photoluminescence spectrum shows a relatively strong broad emission band centered at 4.1 mu m with a width of 0.8 mu m (FWHM) under 1770 nm excitation at room temperature and reveals effective Cr2+ -> Fe2+ energy transfer process. Room temperature photoluminescence decay about 8 mu s was measured. All the results indicate that Cr,Fe:ZnSe could achieve laser operation at 3.7-4.5 mu m via Cr2+ -> Fe+ energy transfer using a more convenient laser pump source in the near IR region. (C) 2016 Published by Elsevier B.V.
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