Photo-induced effect of ferroelastic phase transition in KD3(SeO3)2

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Abstract
The laser-light refraction method has been performed to investigate the photo-induced effect in an early stage of ferroelasitc domain formation in KD3(SeO3)2 crystal. The refracted light intensity has been observed in the temperature region (298.5K–300K) around the transition point (Tc). The temperature dependence of the refracted intensity under the irradiation 266 nm with 130 fs width is drastically different from that without UV-light irradiation. The discrepancy is clear in the temperature region above Tc. The results clearly demonstrate that the pulsed laser illumination produces a large effect in the embryonic fluctuation near Tc.