A HOLOGRAM YOU CAN TOUCH: New plasma lasers that instantly interact to human touch.
While this is not the first team to use this technology it is the first to create a safe prototype that does not burn your finger upon contact. USING FEMTOSECOND LASERS
(a femtosecond is a quadrillionth of a second, and the lasers transmit bursts that last 30 to 270 femtoseconds), the team can make holograms that are safe.
The images are three-dimensional, with resolutions up to 200,000 dots per second. The voxels are light emitted by plasma that's created when the laser's focused energy ionizes the air.
When touched, the laser feels like sandpaper, says principal investigator Yoichi Ochiai, although some participants thought the plasma felt a little like a static shock.
Apart from creating holograms that are safe to touch, many other problems remain, such as the expensiveness of the technology, as well as the fact that it might be dangerous for the human eye to perceive.
The researchers noted that no one should view the laser beam directly, only the image it projects, and they advise that users still wear infrared glasses until the technology has fully matured.
Other academic institutes are also currently working to make 3D holograms cheaper and safer. For instance Brigham Young University and MIT have found a way to make video holograms possible, using acoustic waves that divide color frequencies safely.
Australian and Chinese researchers meanwhile have discovered that a holographic display is possible using a mesh made from graphene oxide and lasers, which works for a pop-up 3D holographic display, and finally University of Bristol researchers have been able to create holograms that can be touched and seen using ultrasound. #technews #innovation #laser