Abstract
Nd-doped yttrium aluminum borate, NdxY1—xAl3(BO3)4 (NYAB), with large sizes and good optical quality has been grown by the flux method. When the Judd-Ofelt (JO) theory of parity-forbidden electric-dipole transitions of rare earth ions on non-centrosymmetric sites was applied to NYAB, it resulted in a good fit on absorption of the crystal. According to the JO theory, the fitted intensity parameters Ωt (t = 2, 4, and 6) were calculated as 2.19 × 10—20, 1.97 × 10—20, and 3.10 × 10—20 cm2, respectively, with a root mean square deviation of 1.22 × 10—21 cm2. The emission properties of the excited 4F3/2 state have been studied, and the spectral parameters of NYAB crystal were compared with those of NdxGd1—xAl3(BO3)4 (NGAB) crystal. A cw NYAB laser at 1.06 μm end-pumped by a high-power diode laser array has been demonstrated. A maximum output of 3.2 W at 1.06 μm has been achieved with an optical conversion efficiency of 29.1% and an average slope efficiency of 37.5%. It is found that these results approach those of Nd : YVO4 crystal.
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