Spectroscopic characteristics of Cr3+:Al2O3 polycrystalline transparent alumina ceramics

Spectral properties of transparent polycrystalline C3+ : Al2O3 ceramics were studied. The results indicated that the absorption peaks of polycrystalline Cr3+ : Al2O3 ceramics coincide with the absorption spectrum of a ruby single crystal. The crystal field and Racah parameters were calculated according to the Tanabe-Sugano energy level diagram and absorption spectra. The crystal field intensity of Cr3+ : Al2O3 polycrystalline ceramics is almost the same as that of Cr3(+) : Al2O3 single crystal, and the characteristics of the emission spectra still retains the R-line emission even as the Cr3+ concentration increases up to 0.8wt%. In particular, one 670nm emission peak of Cr3+ was first found in the polycrystalline ceramics.