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Terahertz coloured digital holography ranging from 1.39 THz up to 4.25 THz isdemonstrated. It is shown that it can be applied for the investigation oflow-absorbing objects, and it is illustrated via inspection of stacked graphenelayers placed on high-resistivity silicon substrate. Holograms are recordedusing an optically-pumped molecular THz laser operating at discrete emissionlines of 1.39 THz, 2.52 THz, 3.11 THz, and 4.25 THz frequencies and it unveiledthat phase-shifting methods allow to qualitatively reconstruct coloured THzholograms with improved quality achieved by removing unwanted informationrelated with so-called DC term and conjugated beam forming virtual image.

Coloured Digital Terahertz Holography Within 1.39-4.25 THz range