Optical Transitions in Cr Doped Bi₄Ge₃O₁₂ Crystal

In this paper, we present the results of the optical absorption spectra of Cr doped Bi₄Ge₃O₁₂ crystal at room temperature and compare them with the theoretical results of a multifold scattering (MS)-Xα calculation which include the energy-level structures and the transition energies of Cr³⁺ and Cr⁴⁺ located in Ge-site in the crystal.