Abstract
The spectroscopic properties of ions in crystals have been investigated using optical absorption, luminescence and lifetime measurements in the 5-300 K temperature range. The low temperature, polarized absorption spectra of in this matrix have allowed us to identify the Stark levels of the different multiplets up to 30 000 . The results are consistent with symmetry for the rare-earth ions and a singlet A character for the lowest Stark level of the ground state. Several transitions show additional structure which indicates multi-site occupancy for the ions. The measured oscillator strengths of the transitions between the J manifolds at 300 K are compared with those derived from the Judd-Ofelt theory. The radiative transition rates and radiative lifetimes have been calculated. The luminescence observed at 5 K has been attributed to (18 100 ), (15 060 ) and (13 150 ) transitions. The obtained data are used to discuss the radiative properties for luminescent levels of ions in the matrix. The emission cross-section of a potential laser line at 2 m connected with the transition is estimated.
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