High speed terahertz imaging based on optimized galvanometric illumination

Yuzhe Zhang; Ran Ning; Jie Zhao; Shufeng Lin; Lu Rong; Dayong Wang

doi:10.1117/12.3023349

18 June 2024 High speed terahertz imaging based on optimized galvanometric illumination

Yuzhe Zhang, Ran Ning, Jie Zhao, Shufeng Lin, Lu Rong, Dayong Wang

Proceedings Volume PC12996, Unconventional Optical Imaging IV; PC129960I (2024) https://doi.org/10.1117/12.3023349
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

High speed terahertz imaging based on optimized galvanometric illumination Yuzhe Zhang, Ran Ning, Jie Zhao, Shufeng Lin, Lu Rong, Dayong Wang The pursuit of high-resolution, high-fidelity, real-time imaging is receiving significant attention in terahertz community. In this study, a versatile illumination approach based on a dual-mirror galvanometer is proposed and optimized for terahertz full-field imaging and computed terahertz tomography. We analyzed the mechanism of galvanometric illumination and elucidated three main factors affecting its homogeneity properties. In this illumination module, the terahertz beam is deflected rapidly by the galvanometer which is driven by triangular voltage signals, and then focused by a self-designed aspherical f-θ lens to illuminate the object at an equal lateral scanning velocity. A homogeneous illumination field with a speckle contrast of 0.11 and isotropic imaging resolution is recorded by an array detector in the form of non-correlated accumulation in a single integration time. By virtue of leading illumination homogeneity and parallelism, a compact imaging system is built for 2D and 3D terahertz imaging with high imaging speed and fidelity.

Conference Presentation

Citation Download Citation

Yuzhe Zhang, Ran Ning, Jie Zhao, Shufeng Lin, Lu Rong, and Dayong Wang "High speed terahertz imaging based on optimized galvanometric illumination", Proc. SPIE PC12996, Unconventional Optical Imaging IV, PC129960I (18 June 2024); https://doi.org/10.1117/12.3023349

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