■ Case 1
User interface in air with tangible feedback.
■ Case 2
Display in air enabling images to be viewed from any direction, covering 360°.
＜ Theory ＞
■ Laser plasma
It is well known that by creating a focal point of high-intensity laser in air, light-emitting plasma can be generated. It is possible to draw lines or surfaces by scanning the focal point rapidly using a galvano-mirror and creating multiple focal points simultaneously using an SLM. The images drawn with the emitted light can be observed from any direction, covering 360°.
■ Femtosecond Laser
It is not possible to touch conventional laser plasma displays with hands directly, as the energy at the focal point is too intense. In our technology, because a femtosecond pulse laser is used with an extremely short pulse duration, the damage is very limited even in direct contact with the skin, making it touchable.
■ International conferences papers
[Journal] Yoichi Ochiai, Kota Kumagai, Takayuki Hoshi, Jun Rekimoto, Satoshi Hasegawa, and Yoshio Hayasaki. 2016. Fairy Lights in Femtoseconds: Aerial and Volumetric Graphics Rendered by Focused Femtosecond Laser Combined with Computational Holographic Fields. ACM Trans. Graph. 35, 2, Article 17 (February 2016), 14 pages. DOI:https://doi.org/10.1145/2850414\
[Poster] Yoichi Ochiai, Kota Kumagai, Takayuki Hoshi, Jun Rekimoto, Satoshi Hasegawa, and Yoshio Hayasaki. 2015. Fairy lights in femtoseconds: aerial and volumetric graphics rendered by focused femtosecond laser combined with computational holographic fields. In ACM SIGGRAPH 2015 Posters (SIGGRAPH '15). ACM, New York, NY, USA, Article 72, 1 pages. DOI: https://doi.org/10.1145/2787626.2792630\
[Demo] Yoichi Ochiai, Kota Kumagai, Takayuki Hoshi, Jun Rekimoto, Satoshi Hasegawa, and Yoshio Hayasaki. 2015. Fairy lights in femtoseconds: aerial and volumetric graphics rendered by focused femtosecond laser combined with computational holographic fields. In ACM SIGGRAPH 2015 Emerging Technologies (SIGGRAPH '15). ACM, New York, NY,USA, Article 10, 1 pages. DOI: https://doi.org/10.1145/2782782.2792492