You Can Feel These Plasma Holograms Made With Femtosecond Lasers



In a research paper they submitted to the Special Interest Group on Graphics and Interactive Techniques (SIGGRAPH), the experts specially noted that this invention is far more different from the previously invented because people can actually feel the laser light when touched.

Holography uses lasers to record the brightness, contrast and dimensions of an image and project this image, typically in 3D, which can be viewed without specialist glasses.

The safe-to-touch aspect of the image is accomplished by the reducing the duration of laser bursts to higher resolution femtoseconds, instead of lower resolution femtoseconds and nanoseconds.

A Japanese company called Aerial Burton has been using lasers to ionize air molecules in midair for a few years now, thereby creating bright pixels that float in space.

The researchers fired the femtosecond laser through what’s known as a spatial light modulator and a series of lenses into a Galvano scanner.

This may still be in the research phase, but this will help in designing femtosecond laser displays in the future.

The laser beam is split into two and, through the use of mirrors, is directed at the object and the recording medium.

A camera under the hologram is then able to capture and record a user’s interactions, allowing the voxels to be ‘touched.’.

For starters, it does not require physical matter arranged and suspended in air to emit light, and it does not require wires and structures that obstruct the line-of-sight. It’s important to note that these incredible videos look really close to magic, a prerequisite for any sufficiently advanced technology. For safety, the plasma voxels are shut off within a single frame (17 ms = 1/60 s) when users touch the voxels. In the past, a laser pulsing at a nanosecond resulted in images containing a significant amount of energy; touch it or walk through it, and you risked being burnt. But according to the researchers, they could be scaled up, and potentially used in an array of augmented reality or “aerial display” applications.

Scientists at the University of Tsukuba, Utsunomiya University, Nagoya Institute of Technology, and the University of Tokyo now hope that the interaction with the laser-created images will create a unique experience.

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