4.6 Article

Frequency-modulated continuous-wave 3D imaging with high photon efficiency

期刊

OPTICS LETTERS
卷 47, 期 14, 页码 3568-3571

出版社

Optica Publishing Group
DOI: 10.1364/OL.463007

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资金

  1. National Natural Science Foundation of China [12104443, 62031024, 21XD1403800]
  2. Shanghai Science andTechnology Development Foundation [22JC1402900]
  3. Shanghai Municipal Science and Technology Major Project [2019SHZDZX01]
  4. Special Project for Research and Development in Key areas of Guangdong Province [2020B0303020001]

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This paper proposes a photon-efficient approach for FMCW LIDAR, utilizing single-photon detectors and neighboring pixel data to improve depth estimation accuracy, achieving high-quality 3D imaging in low-flux conditions.
Frequency-modulated continuous-wave (FMCW) light detection and ranging (LIDAR), which offers high depth resolution and immunity to environmental disturbances, has emerged as a strong candidate technology for active imaging applications. In general, hundreds of photons per pixel are required for accurate three-dimensional (3D) imaging. When it comes to the low-flux regime, however, depth estimation has limited robustness. To cope with this, we propose and demonstrate a photon-efficient approach tier FMCW LIDAR. We first construct a FMCW LIDAR setup based on single-photon detectors where only a weak local oscillator is needed for the coherent detection. Further, to realize photon-efficient imaging, our approach borrows the data from neighboring pixels to enhance depth estimates, and employs a total-variation seminorm to smooth out the noise on the recovered depth map. Both simulation and experiment results show that our approach can produce high-quality 3D images from -10 signal photons per pixel, increasing the photon efficiency by 10-fold over the traditional processing method. The high photon efficiency will be valuable for low-power and rapid FMCW applications. (C) 2022 Optica Publishing Group

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