Abstract
Nd-doped gadolinium aluminium tetraborate NdxGd1-xAl3(BO3)4 (NGAB) crystals have been grown by flux method, with large sizes and good optical quality as well as different Nd3+ ion densities of 0 to 10 at.% in the lattice structure. These crystals belong to the trigonal system with point group 32, conforming space group R32. The unit cell constants are a=0.9305(8) and c=0.7248(1) nm, V=0.5436 nm3 for a Nd3+ content of 10 at.%. When Judd–Ofelt (JO) theory of parity-forbidden electric-dipole transitions of rare earth ions on non-centrosymmetric sites is applied to NGAB, it results in a good fit on absorption of the crystal. The three intensity parameters Ωt are fitted as 1.559×10-20, 1.751×10-20 and 2.395×10-20 cm2 at t=2, 4 and 6 respectively, with a root-mean square deviation of 9.35×10-22 cm2. The spectral parameters of NGAB crystal have indicated that it is a promising candidate of self-frequency doubling crystals.
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