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The Er-doped YAB (YAI_,(B011~) is a potential self-frequency-doubling laser material. Single crystals were grown by the top-seeded flux method. The absorption spectra of the infrared Er'+ transitions were monitored in YAB crystals in the 9 300 K tempernture rnnge by high-resolution Fourier transform spectroscopy. In the whole spectral rnnge the energy levels and Stark components of 12 transitions were detectable. In this paper the two mfrared transitions (from the 4 1 1~12 gmund state to the 4 l1.1 12 and 4 1 11 ;2 levels) were analyzed in detail. The low tempernture absorption spectra of Er:YAB consist of sharp lines, the number of which corresponds to the theoretical predictions. This suggests that Er-' 1 ions occupy one specific lattice site (yttrium positions) with negligible aggregation at the higher dopant concentrntions investigated (i.e. 0.12 Eratom/YAB mole).

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