Temperature-dependent second harmonic generation in 6LiRbSO4 and 7LiRbSO4

Abstract Temperature-dependent second harmonic generation efficiencies of 6 LiRbSO 4 and 7 LiRbSO 4 have been measured across the ferroelectric phase IV region (166 – 185 °C), using the crystalline powder of 38 – 63 μm particle size range. The transition temperatures have not been changed by the lithium isotope substitution. More polarizable 6 LiRbSO 4 has higher second harmonic generation efficiency than 7 LiRbSO 4 up to 10%. We obtain unbalanced twin-peak-shaped patterns of thermal hysteresis. The unique hysteresis pattern of LiRbSO 4 is ascribed to the very narrow temperature region of the phase IV, and to the overlapping of two hysteresis curves with very different widths.

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