Abstract
The optical absorption spectra of erbium-doped potassium tantalate (KTaO3:Er) crystals have been studied. Absorption lines corresponding to the intraconfiguration f-f electron transitions from the 4I15/2 ground state to the levels of 4F9/2, 4S3/2,2H11/2, 4F7/2, 4F5/2(4F3/2), 2H9/2, and 4G11/2 excited states of Er3+ ions have been observed in a wavelength range of 350–660 nm. The transitions to 4F9/2, 2H11/2, 4F7/2, and 2H9/2 levels have been studied in detail at T = 2 K. Based on the obtained results, it is suggested that Er3+ impurity centers of two types exist in KTaO3:Er3+ crystals. The number of lines observed for the major type centers corresponds to that theoretically possible for Er3+ ions in a noncubic crystal field with a local compensation of the impurity charge. The energy positions of the levels of excited states for the observed transitions are determined.
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