Absorption and photoluminescence spectroscopy of diffusion-doped ZnSe:Cr2+

  • C. I. Rablau
  • J. -O. Ndap
  • X. Ma
  • A. Burger
  • N. C. Giles
Special Issue Paper

Abstract

ZnSe:Cr2+ is an attractive candidate as a room-temperature tunable solid-state laser with output in the 2–3 µm range. Passive absorption losses in this emission range currently limit laser performance. In this study, we use absorption and photoluminescence spectroscopies at 5 and 296K to address the origin of these optical losses. A series of diffusion-doped ZnSe:Cr single-crystal samples with Cr2+ concentrations in the range from 2×1017 cm−3 to 9×1019 cm−3 were obtained using CrSe powder as the dopant source. We find that trace amounts of Fe2+ produce absorption in the 2–3 µm range. Also, we have obtained data on a 680 nm absorption band observed in ZnSe:Cr which has been assigned to an internal transition of Cr2+. In our series of samples, the relative intensities of the 680 nm absorption band do not track the relative intensities of the 1.8 µm band (known to be due to Cr2+), although excitation near 680 nm does produce weak Cr2+ luminescence. Our absorption data do not support the current assignment of the 680 nm absorption as being an internal transition of the Cr2+ ion.

Key words

Absorption chromium doping photoluminescence (PL) solid-state lasers ZnSe 

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Copyright information

© TMS-The Minerals, Metals and Materials Society 1999

Authors and Affiliations

  • C. I. Rablau
    • 1
  • J. -O. Ndap
    • 2
  • X. Ma
    • 2
  • A. Burger
    • 2
  • N. C. Giles
    • 1
  1. 1.Department of PhysicsWest Virginia UniversityMorgantown
  2. 2.Center for Photonic Materials and Devices, Department of PhysicsFisk UniversityNashville

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