Abstract
Some vanadate materials were investigated as second harmonic generation (SHG) materials for Nd: YAG lasers. Li 3VO 4 and its derivative crystals, Li 2ZnSiO 4 and Li 2MgGeO 4, were found as a new type of SHG crystal. Their crystal structure belongs to the Li 3PO 4 type, which is formed of only MO 4 (M is Li, Zn, Si, Ge, V) oxygen tetrahedra. The SHG coefficients, d ij , of the Li 3VO 4 single crystal was measured by the Maker fringe method and the non-linear coefficient was found to be of the same order as that of KTiOPO 4. The origin of SHG in Li 3VO 4 was discussed from its electronic and crystal structure. The covalency of Li 3VO 4 is important for SHG and, further, the distorted and parallel oriented VO 4 tetrahedra enhance the SHG coefficient.
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