http://j.people.com.cn/n3/2022/0720/c95952-10125344.html

The majority of current 3D imaging technologies use the visual difference between the two eyes and the virtual synthesis of the brain to produce a “fake 3D image” on the display. The latest 3D imaging technology, however, uses a 3D physical space to bring up figures.　Scientists at the Hongtu Ultrafast Laser Joint Laboratory in the Wuhan Donghu Hi-Tech Development Zone develop 3D imaging technology based on femtosecond laser plasma induction. The high-peak power femtosecond laser emits at high intensity of 100 TW per cm2, inducing plasma emission. A 3D scanner scans the laser and rearranges and combines the luminous dot matrix to form various characters and designs in mid-air. 3D images can be displayed directly in the air without the need for displays or fog. At the same time, femtosecond lasers have shorter pulse durations than nanosecond lasers, require less energy, have shorter single-point stop times, and are safer.