Abstract

Tm-doped YAB single crystals were grown by the top-seeded flux technique. High resolution (0.04 cm −1) Fourier transform spectroscopy was employed to determine the term diagram of Tm 3+ ions in YAB. Six transitions were identified from the 3H 6 ground state of the Tm 3+ ions to the 3F 4, 3H 5, 3H 4, 3F 3, 3F 2, and 1G 4 manifolds. All of their Stark components were assigned by using the temperature dependence (9–100 K) of the absorption lines. The low temperature spectra consists of sharp lines, broadened ones and those split to components. These features may be attributed to Tm–Tm interaction and optical hyperfine structure.

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