It can be used to optimize the all optical switch design for different materials (self focus and defocus), nonlinear indices and wavelengths.

此设计方法可以对不同的材料(自聚焦、自散焦)、不同的非线性折射率和波长等进行波导全光开关优化设计。

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The lens may take a variety of shapes, including Fresnel features, and may focus, collimate, or defocus the ultrasonic energy.

透镜可以采用多种形状，包括菲涅尔特征并且可以聚焦、准直或散焦该超声能量。

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