Spectroscopy of cobalt-doped single crystals of gallium spinels as potential laser materials
- Belarussian State Univ., Minsk (Belarus); and others
Optical absorption and luminescence of cobalt-doped crystals of lithium-gallium (LGO) and zinc-gallium (ZGO) spinels are studied. Absorption in the regions of 20500, 17000, and 6500 cm{sup -1} and broadband luminescence in the regions of 680, 900, and 1200 nm are attributed to tetracoordinated Co{sup 2+} ions. Good agreement between the absorption spectra and the diagram of levels calculated on the basis of the crystal field theory is obtained. Luminescence is caused by transitions from the {sup 4}T{sub 1}({sup 4}P) excited level to lower levels. The luminescence decay time of Co:LGO and Co:ZGO at room temperature equals 440 and 850 ns, respectively. At liquid nitrogen temperature, it increases by no more than 20 and 40%, respectively. Co:LGO shows the concentration dependence of the luminescence kinetics. 11 refs., 4 figs., 3 tabs.
- OSTI ID:
- 135874
- Journal Information:
- Optics and Spectroscopy, Vol. 79, Issue 3; Other Information: PBD: Sep 1995; TN: Translated from Optika i Spektroskopiya; 79: No. 3, 465-470(1995)
- Country of Publication:
- United States
- Language:
- English
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