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Computer-generated volume holograms fabricated by femtosecond laser micromachining

机译:飞秒激光微加工制造的计算机生成的体积全息图

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摘要

We define computer-generated volume holograms (CGVHs) as arbitrary 3D refractive index modulations designed to perform optical functions based on diffraction, scattering, and interference phenomena. CGVHs can differ dramatically from classical volume holograms in terms of coding possibilities, and from thin computer-generated holograms in terms of efficiency and selectivity. We propose an encoding technique for designing such holograms and demonstrate the concept by scanning focused femtosecond laser pulses to produce localized refractive index modifications in glass. These CGVHs show a significant increase in efficiency with thickness. Consequently, they are attractive for photonic integration with free-space and guided-wave devices, as well as for encoding spatial and temporal information.
机译:我们将计算机生成的体积全息图(CGVHs)定义为任意3D折射率调制,旨在执行基于衍射,散射和干涉现象的光学功能。 CGVHs在编码可能性方面与经典的体积全息图有很大差异,在效率和选择性方面与计算机生成的稀薄全息图有很大差异。我们提出了一种用于设计此类全息图的编码技术,并通过扫描聚焦的飞秒激光脉冲以在玻璃中产生局部折射率变化来演示该概念。这些CGVH的效率随厚度显着提高。因此,它们对于与自由空间和导波设备进行光子集成以及对空间和时间信息进行编码很有吸引力。

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