Cd4InO(BO3)3: A New Nonlinear Optical Crystal Exhibiting Strong Second Harmonic Generation Effect and Moderate Birefringence
A new noncentrosymmetric cadmium indium borate, Cd4InO(BO3)3(CIBO) has been successfully developed via a standard solid-state reaction. Its crystal structure was confirmed by the single crystal X-ray diffraction, which shows that CIBO belongs to the non-centrosymmetric and polar space groupCm. Its structure contains the distorted InO6and CdOn(n = 6, 8) polyhedra, which link together by sharing an edge or corner to build a three dimensions framework with BO3triangles accommodated in tunnels. Benefiting from the approximately parallel configuration of BO3triangles, CIBO exhibited a strong second harmonic generation (SHG) effect (3 × KDP), and moderate birefringence of 0.077@1064 nm. Further optical and thermal characterizations suggest that CIBO possesses a wide transparent window and good thermal stability. Theoretical calculation reveals that the macroscopic SHG coefficients of CIBO results from the synergistic effect of the parallel arrangement of BO3groups andd10Cd2+cation.
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