Domain control method for nonlinear ferroelectric optical material

Abstract

Abstract PURPOSE:To eliminate the need for impression of a voltage and to avoid the failure in a crystal generated by the flow of current and the degradation in purity by the diffusion of an electrode material by disposing absorbers or reflectors of electromagnetic waves for heating a nonlinear ferroelectric optical material to be formed with domain inversion structure parts on one main surface of this optical material. 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 deg.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.

Inventors

• 👤 Masahiro Yamada
• 👤 正裕 山田
• 👤 Kouichirou Kijima
• 👤 公一朗 木島

Bibliographic Details