Holography¹ has always held special appeal as it is able to record and display spatial information in three dimensions^{2,3,4,5,6,7,8,9,10}. 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^13,14,15 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 comb¹⁶), 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.

全息¹一直具有特殊的吸引力，因为它能够在^{2、3、4、5、6、7、8、9、10}三个维度上记录和显示空间信息。在这里，我们展示了如何通过同时在精确定义的光学频率下使用大量窄激光线来增强数字全息术^{11,12的能力。}使用基于两个频率梳^{13、14、15的干涉仪}在重复频率略有不同和无透镜相机传感器的情况下，我们记录了产生复杂全息图的光谱超立方体的时变空间干涉图案，揭示了每个梳状线频率的散射波场的幅度和相位。超越多色全息术和低相干全息术（包括频率梳¹⁶），双梳全息术中宽光谱带宽和高时间相干性的协同作用开辟了新的光学诊断，例如在没有干涉相位的大距离上进行精确的尺寸计量模糊性，或具有高光谱分辨率的高光谱三维成像，正如我们通过吸收气体的分子选择性成像所证明的那样。