Spectroscopic properties of HoFe3(BO3)(4), NdFe3(BO3)(4) and Ho0.75Nd0.25Fe3(BO3)(4) single crystals

Sukhachev, A. L.; Malakhovskii, A. V.; Aleksandrovsky, A. S.; Gudim, I. A.; Temerov, V. L. Source: OPTICAL MATERIALS, 83 87-92; 10.1016/j.optmat.2018.05.078 SEP 2018

Polarized absorption spectra of ferroborates HoFe₃(BO₃)₄, NdFe₃(BO₃)₄ and Ho_0.75Nd_0.25Fe₃(BO₃)₄ were measured at room temperature in spectral range 4000–24500 cm⁻¹ (400–2500 nm). The studied single crystals were grown from solution-melts. Intensities of the f-f transitions were measured and the Judd–Ofelt parameters Ω_λ of Ho³⁺ and Nd³⁺ ions in the studied crystals were calculated. It was revealed that the crystals content not strongly influences the Judd–Ofelt parameters. The Ω₂ parameter for Ho³⁺ ion is the most sensitive to the crystal content. Linear dichroism of the hypersensitive transitions appeared to be the largest one for both rare earth ions.