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The optical properties of NdxGd1-xAl3(BO3)4(NGAB) crystal are reported. The refractive index of it were mesured by V-prism method. The absorption spectra and the flourescence specra of NGAB were also obtained. The optical parameters of NGAB were calculated following J-O theory, the three optical parameters are Ω2 = 1.805 × 10−20, Ω4 = 1.85 × 10−20, Ω6 = 3.793 × 10−20(RMS= 1.4 × 10−7) and βc(4F3/2...