Nonlinear photonic crystals have been employed as computer-generated holograms to manipulate the wavefront of the nonlinear waves. However, the disadvantages of the binary-fabricated structures gradually appear because of their adverse effects on the manipulation quality, especially in the field of nonlinear shaping and imaging. A generalized encoding method has been proposed for constructing nonlinear holographic processes of high quality, which is called a quasi-multivalue-encoding method. Both theoretical and experimental results demonstrate that, compared with the conventional binary encoding method, this generalized encoding method is helpful to reduce the distortion and high-order diffraction effects. The integrated ability to convert the light frequency and to reshape its wavefront with a high resolution in any desired way can be very useful for all-optical shaping, switching, imaging, manipulating, and so on.

中文翻译：

---

非线性光子晶体中非线性波前成形和成像的广义准多值编码方法

非线性光子晶体已被用作计算机生成的全息图来操纵非线性波的波前。然而，二元制造结构的缺点逐渐显现，因为它们对操纵质量产生不利影响，特别是在非线性整形和成像领域。提出了一种用于构建高质量非线性全息过程的广义编码方法，称为准多值编码方法。理论和实验结果都表明，与传统的二进制编码方法相比，这种广义编码方法有助于减少失真和高阶衍射效应。