Near-infrared 3D imaging with upconversion detection

He Zhang, Santosh Kumar, Yong Meng Sua, Shenyu Zhu, Yu Ping Huang

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We demonstrate a photon-sensitive, three-dimensional (3D) camera by active near-infrared illumination and fast time-of-flight gating. It uses picosecond pump pulses to selectively upconvert the backscattered photons according to their spatiotemporal modes via sum-frequency generation in a χ2 nonlinear crystal, which are then detected by an electron-multiplying CCD with photon sensitive detection. As such, it achieves sub-millimeter depth resolution, exceptional noise suppression, and high detection sensitivity. Our results show that it can accurately reconstruct the surface profiles of occluded targets placed behind highly scattering and lossy obscurants of 14 optical depth (round trip), using only milliwatt illumination power. This technique may find applications in biomedical imaging, environmental monitoring, and wide-field light detection and ranging.

Original languageEnglish
Pages (from-to)2760-2767
Number of pages8
JournalPhotonics Research
Volume10
Issue number12
DOIs
StatePublished - 1 Dec 2022

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