In article number 2000224 by Yan Sheng and co‐workers, nonlinear volume holography is realized by 3D micro‐engineering the second‐order nonlinear coefficient of a ferroelectric crystal with femtosecond laser pulses. A proof‐of‐concept nonlinear reconstruction of second harmonic vortex beam is demonstrated. The 3D nonlinear volume holography provides a universal approach for efficient generation of coherent light at new frequencies with predesigned phase and amplitude structures.

中文翻译：

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非线性体积全息术：3D非线性光子晶体中的非线性体积全息术（Laser Photonics Rev. 14（11）/ 2020）

在Yan Sheng及其同事的文章2000224中，非线性体积全息是通过3D微工程技术利用飞秒激光脉冲对铁电晶体的二阶非线性系数进行实现的。演示了二次谐波涡旋光束的概念验证非线性重建。3D非线性体积全息技术提供了一种通用方法，可通过预先设计的相位和幅度结构在新频率下高效生成相干光。