A nonlinear hologram enables to record the amplitude and phase of a waveform by spatially modulating the second order nonlinear coefficient, so that when a pump laser illuminates it, this waveform is reconstructed at the second harmonic frequency. The concept was now extended to enable the generation of multiple waveforms from a single hologram, with potential applications in high density storage, quantum optics, and optical microscopy.

中文翻译：

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在 3D 非线性光子晶体中存储和检索多个图像

非线性全息图能够通过对二阶非线性系数进行空间调制来记录波形的幅度和相位，这样当泵浦激光照射它时，该波形就会以二次谐波频率重建。该概念现已扩展到能够从单个全息图生成多个波形，在高密度存储、量子光学和光学显微镜方面具有潜在应用。