Visualization of internal structure and internal stress in visibly opaque objects using full-field phase-shifting terahertz digital holography

We construct a full-field phase-shifting terahertz digital holography (PS-THz-DH) system by use of a THz quantum cascade laser and an uncooled, 2D micro-bolometer array. The PS-THz-DH enables us to separate the necessary diffraction-order image from unnecessary diffraction-order images without the n...

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Bibliographic Details
Published in:Optics express 2019-11, Vol.27 (23), p.33854-33868
Main Authors: Yamagiwa, Masatomo, Minamikawa, Takeo, Minamiji, Fui, Mizuno, Takahiko, Tokizane, Yu, Oe, Ryo, Koresawa, Hidenori, Mizutani, Yasuhiro, Iwata, Tetsuo, Yamamoto, Hirotsugu, Yasui, Takeshi
Format: Article
Language:English
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Summary:We construct a full-field phase-shifting terahertz digital holography (PS-THz-DH) system by use of a THz quantum cascade laser and an uncooled, 2D micro-bolometer array. The PS-THz-DH enables us to separate the necessary diffraction-order image from unnecessary diffraction-order images without the need for spatial Fourier filtering, leading to suppress the decrease of spatial resolution. 3D shape of a visibly opaque object is visualized with a sub-millimeter lateral resolution and a sub-µm axial resolution. Also, the digital focusing of amplitude image enables the visualization of internal structure with the millimeter-order axial selectivity. Furthermore, the internal stress distribution of an externally compressed object is visualized from the phase image. The demonstrated results imply a possibility for non-destructive inspection of visibly opaque non-metal materials.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.27.033854