Abstract
We report the results of four-wave-mixing (FWM) spectroscopy in ferroelastic crystal NdGaO 3 on subpicosecond time scale. It is observed that the Stark-split absorption lines at 585 nm in NdGaO 3 show subpicosecond dephasing and FWM signal of a symmetric time profile at low temperature when excited by incoherent laser light. The behavior of the absorption lines is considered to result from the ferroelastic nature of NdGaO 3. A femtosecond dephasing at room temperature is also reported.
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