Spectroscopy of Phonon and Vibronic States of YbAl_(3)(BO_(3))_(4) Single Crystal

摘要

The polarized Raman and reflection spectra of a single crystal YbAl_(3)(BO_(3))_(4) at room temperature were studied. Raman active vibrational modes A_(1), E_(TO), and E_(LO) are identified. In the Raman spectrum, we detected an intense line at a frequency of 1018 cm~(-1), which refers to internal vibrations of the BO_(3) group and is known to be promising for use in amplifiers based on stimulated Raman scattering. From the simulation of reflection spectra by the method of dispersion analysis the frequencies of A_(2) vibrational modes were determined. Intense bands observed in the low-temperature transmission spectra in the range of f-f transitions in the Yb~(3+) ion are attributed to electron-phonon transitions. The Raman lines are compared with electron-phonon lines in the transmission spectrum.