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Nonlinear surface waves on the boundary of a photorefractive crystal

机译：光折射晶体边界上的非线性表面波

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Excitation of nonlinear surface waves is studied at the SBN-75 crystal - air interface. The SBN-75 crystal is characterised by the diffusion-type photorefractive nonlinearity, the surface wave being excited in the surface layer and the depth of its penetration into the crystal being determined by the nonlinear crystal parameters. Because of a large refraction coefficient in SBN-75, the penetration depth of the surface wave into the air is small; therefore, the nonlinear surface wave is localised in the surface crystal layer several micrometers in thickness. The oscillating intensity distribution of the surface wave at the output end of the crystal is measured. The oscillation period is determined by the angle of incidence of the exciting beam. The nonlinear wave is excited not only at the crystal - air interface but also in the case when the active surface of the crystal is covered by an electrode, for example, an aquadag layer. This circumstance opens up a possibility of studying new properties of the surface waves when an external electric field is applied to the crystal.
机译：在SBN-75晶体-空气界面上研究了非线性表面波的激励。 SBN-75晶体的特征在于扩散型光折变非线性，表面波在表面层中被激发，其穿透晶体的深度由非线性晶体参数确定。由于SBN-75中的折射率较大，因此表面波对空气的穿透深度较小;因此，非线性表面波位于厚度为几微米的表面晶体层中。测量晶体输出端的表面波的振荡强度分布。振荡周期由激发光束的入射角决定。非线性波不仅在晶体-空气界面处被激发，而且在晶体的有源表面被电极覆盖时，例如在aquadag层中也会被激发。当将外部电场施加到晶体上时，这种情况为研究表面波的新特性开辟了可能性。

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