Laser & Optoelectronics Progress, Volume. 60, Issue 18, 1811013(2023)
Depth-of-Field Extension Technology for Terahertz Self-Mixing Interferometric Imaging
Terahertz waves have a wide range of applications in biology and hazardous explosive detection, but they suffer limitations in imaging owing to the sensitivity of the corresponding detectors. Herein, we demonstrate a self-mixing coherent imaging system with a terahertz quantum cascade laser. We achieve imaging with a large depth of field in the terahertz band by combining the holographic imaging technology and self-mixing interferometric measurement. We imaged an area of 2 pair line per millimeter on a resolution board in the off-focus plane in two dimensions using a feature like self-mixing of a transceiver. We obtain the same image contrast as that on the focal plane when the imaging plane is 56 times the wavelength offset.
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Jiaxuan Cai, Yan Xie, Yang Yu, Yingxin Wang, Meng Chen, Ziran Zhao, Peng Bai, Ning Yang, Weidong Chu. Depth-of-Field Extension Technology for Terahertz Self-Mixing Interferometric Imaging[J]. Laser & Optoelectronics Progress, 2023, 60(18): 1811013
Category: Imaging Systems
Received: May. 18, 2023
Accepted: Jun. 20, 2023
Published Online: Sep. 19, 2023
The Author Email: Xie Yan (xie_yan@tsinghua.edu.cn), Zhao Ziran (zhaozr@tsinghua.edu.cn), Chu Weidong (chu_weidong@iapcm.ac.cn)