Detailed Spectroscopic and Theoretical Analysis of Yb:LuAG Crystal at Cryogenic and Room Temperatures

Year: 2025

Authors: Demirkhanyan G., Patrizi B., Toci G., Muzhikyan P., Vannini M., Pirri A., Margaryan M., Kostanyan R.

Autors Affiliation: NAS Armenia, Inst Phys Res, Ashtarak, Armenia; Armenyan State Pedag Univ, Yerevan, Armenia; CNR INO, Ist Nazl Ott, Sesto Fiorentino, FI, Italy; IFAC, CNR, Ist Fis Applicata Nello Carrara, I-50019 Sesto Fiorentino, FI, Italy; Natl Acad Sci Armenia, Yerevan, Armenia.

Abstract: By the analysis of the low-temperature absorption and emission spectra of the crystal 20% Yb3+:Lu3Al5O12, the energies of the Stark levels of Yb3+ ion in dodecahedral positions are determined. Within the framework of the crystal field (CF) theory of point charges (D-2 point symmetry group), the CF parameters are determined, and the wave functions of the Stark states are constructed. The line strengths of indirect electric dipole and magnetic dipole inter-Stark transitions are calculated and the Judd-Ofelt parameters are determined. Low temperature absorption and emission spectra show a complex fine structure that cannot be explained on the basis of the standard level structure of Yb3+ occupying sites with dodecahedral crystal field symmetry.

Journal/Review: JOURNAL OF CONTEMPORARY PHYSICS-ARMENIAN ACADEMY OF SCIENCES

Volume: 60 (1)      Pages from: 29  to: 34

More Information: This work was supported by the joint program between the Ministry of Education, Science, Culture and Sport of the Republic of Armenia and the National Research Council of Italy (Project Comparative study of the structural and spectral-kinetic properties of laser-active ceramic and single-crystal garnets YAG, LuAG and YSAG doped with Yb3+ and Tm3+ grant 23SC-CNR-1C007).
KeyWords: Yb3+:Lu3Al5O12 crystal; low temperature absorption and emission spectra; inter Stark transitions; Judd-Ofelt parameters; high-doped Lu3Al5O12 crystal
DOI: 10.1134/S106833722570032X