Coaxial dual-wavelength LiDAR system with GaN transparent detectors

This study proposed a dual-wavelength coaxial light detection and ranging (LiDAR) system leveraging the GaN transparent detector (GaN-TD), which is sensitive to violet light, while maintaining transparency to near-infrared (NIR) radiation. We employed modulated high-frequency pulsed NIR waves and fully modulated sinusoidal violet signals for precise target detection. Our system maintained high measurement precision, achieving millimeter-level precision at a 3.5-m range. The integration of scanning galvanometers into the coaxial configuration enabled the acquisition of high-accuracy distance images at 1.2  m. This research validated the feasibility and benefits of GaN-TD in dual-wavelength LiDAR systems, significantly advancing dual-wavelength LiDAR technology.