Spatio-spectral 4D coherent ranging using a flutter-wavelength-swept laser

Dawoon Jeong, Hansol Jang, Min Uk Jung, Taeho Jeong, Hyunsoo Kim, Sanghyeok Yang, Janghyeon Lee and Chang-Seok Kim ()
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Dawoon Jeong: Pusan National University
Hansol Jang: Agency for Defense Development
Min Uk Jung: Pusan National University
Taeho Jeong: Hyundai Motor Company
Hyunsoo Kim: Hyundai Motor Company
Sanghyeok Yang: Hyundai Motor Company
Janghyeon Lee: Hyundai Motor Company
Chang-Seok Kim: Pusan National University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Coherent light detection and ranging (LiDAR), particularly the frequency-modulated continuous-wave LiDAR, is a robust optical imaging technology for measuring long-range distance and velocity in three dimensions (3D). We propose a spatio-spectral coherent LiDAR based on a unique wavelength-swept laser to enable both axial coherent ranging and lateral spatio-spectral beam scanning simultaneously. Instead of the conventional unidirectional wavelength-swept laser, a flutter-wavelength-swept laser (FWSL) successfully decoupled bidirectional wavelength modulation and continuous wavelength sweep, which overcame the measurable distance limited by the sampling process. The decoupled operation in FWSL enabled sequential sampling of flutter-wavelength modulation across its wide spectral bandwidth of 160 nm and, thus, allowed simultaneous distance and velocity measurement over an extended measurable distance. Herein, complete four-dimensional (4D) imaging, combining real-time 3D distance and velocity measurements, was implemented by solid-state beam scanning. An acousto-optic scanner was synchronized to facilitate the other lateral beam scanning, resulting in an optimized solid-state coherent LiDAR system. The proposed spatio-spectral coherent LiDAR system achieved high-resolution coherent ranging over long distances and real-time 4D imaging with a frame rate of 10 Hz, even in challenging environments.

Date: 2024
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DOI: 10.1038/s41467-024-45297-w

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