Dual-comb hyperspectral digital holography
Dual-comb hyperspectral digital holography
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DOI：
10.1038/s41566-021-00892-x
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发表时间：
2021-11-22
期刊：
影响因子：
35
通讯作者：
Picque, Nathalie
中科院分区：
文献类型：
--
作者：
Vicentini, Edoardo;Wang, Zhenhai;Picque, Nathalie
全息术（1）一直具有特殊的吸引力，因为它能够记录和显示三维空间信息（2-10）。在这里，我们展示了如何通过同时使用大量精确定义的光学频率的窄激光线来增强数字全息术的能力。使用基于两个重复频率略有不同的频率梳（13-15）和无透镜相机传感器的干涉仪，我们记录了随时间变化的空间干涉图案，这些干涉图案生成复杂全息图的光谱超立方体，揭示了每个梳线频率的散射波场的振幅和相位。超越多色全息和低相干全息（包括使用频率梳（16）），双梳全息术中的宽光谱带宽和高时间相干性的协同作用开辟了新颖的光学诊断，诸如在没有干涉相位模糊的大距离上的精确尺寸计量，或者具有高光谱分辨能力的超光谱三维成像，正如我们用吸收气体的分子选择性成像所证明的那样。
Holography(1) has always held special appeal as it is able to record and display spatial information in three dimensions(2-10). Here we show how to augment the capabilities of digital holography(11,12) by using a large number of narrow laser lines at precisely defined optical frequencies simultaneously. Using an interferometer based on two frequency combs(13-15) of slightly different repetition frequencies and a lensless camera sensor, we record time-varying spatial interference patterns that generate spectral hypercubes of complex holograms, revealing the amplitudes and phases of scattered wave-fields for each comb line frequency. Advancing beyond multicolour holography and low-coherence holography (including with a frequency comb(16)), the synergy of broad spectral bandwidth and high temporal coherence in dual-comb holography opens up novel optical diagnostics, such as precise dimensional metrology over large distances without interferometric phase ambiguity, or hyperspectral three-dimensional imaging with high spectral resolving power, as we demonstrate with molecule-selective imaging of an absorbing gas.