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High-resolution terahertz digital holography based on frequency-domain diagonal extension imaging

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Abstract

By leveraging frequency-domain diagonal extension (FDDE) imaging in terahertz (THz) in-line digital holography, the resolution of THz digital holography would be dramatically improved. The holography system in this work which utilizes a CO2-pumped 2.52 THz (118.83 μm) continuous-wave laser as the source and a pyroelectric-array camera with a pixel pitch of 100 μm as the detector could attain a resolution of 150 μm (~1.26 λ) near to the resolution limit of the system. FDDE imaging is a simple and effective method for resolution enhancement, where no new detector or other equipment is employed. Samples are imaged twice from different angles and then the high-frequency components of images are stitched to improve the resolution. Different from the traditional FDDE, weight-FDDE (w-FDDE) which can reduce the visibility distinction between different orientations of the synthetic picture by adding weight factors to produce a superior synthetic image is proposed in this work.

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All data generated and analyzed during this study are included in this article. The work described was original research that has not been published previously, and is not under consideration for publication elsewhere, in whole or in part.

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Acknowledgments

Thanks to S. Jiang et al from Peking University for their help with the FDDE algorithm. Thanks to Y. Zhou from Zhejiang University and B. L Liu from Beihang University for the revision of the manuscript.

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Authors and Affiliations

  1. National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin, 150081, China

    Yao Wang & Qi Li

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  1. Yao Wang
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  2. Qi Li
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The part of experiments, simulations, algorithms, and the first draft of the manuscript were accomplished by Yao Wang. Qi Li helped with the experiment and revised previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yao Wang.

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Wang, Y., Li, Q. High-resolution terahertz digital holography based on frequency-domain diagonal extension imaging. Opt Quant Electron 55, 235 (2023). https://doi.org/10.1007/s11082-022-04509-7

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