Domain control method for nonlinear ferroelectric optical material
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CONSTITUTION: The substrate of a Cherenkov radiation type light second harmonic wave generating element having the periodic domain inversion structure parts is constituted of the crystal of lithium niobate having a large nonlinear coefft. and a C-axis in the thickness direction of the crystal at the time of forming the above-mentioned element. Namely, the optical material 1 formed as the single domain having the C-axis in the thickness direction is prepd. The material is heated up to the temp. below the Curie point thereof. for example, up to about 1,200°C and the external DC voltage is impressed in the thickness direction thereof to generate the domains unified in the thickness direction of the C-axis at the time of forming the above-mentioned material as the single domain. The absorbers or reflectors 2 consisting of Pt having the heat resistance to heat rays for heating are previously provided in the form of stripes on one main surface 1a of material 1 and the polarization inversion is generated by the voltage generated by the pyroelectric effect.
COPYRIGHT: (C)1991,JPO&Japio，下面是Domain control method for nonlinear ferroelectric optical material专利的具体信息内容。
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6 热电元件
