Abstract
Optical second harmonic generation (SHG) and birefringence Δn of ferroelectric LaBGeO5 are measured as a function of temperature. Using the Maker-Fringe method, magnitudes of SHG tensor components and coherence lengths are determined. From the symmetry analysis of d tensor components, the space group of the paraelectric phase is assigned to be non-centrosymmetric P312. The critical index of the order parameter is determined to be 0.5 from the birefringence measurement in the vicinity of TC.
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