Laser-excited volumetric display using aerial re-imaging by parabolic mirrors

A volumetric display forms three-dimensional (3D) graphics in real space by generating light emission or scattering points as volume pixels (voxels). In order to realize this display, we have proposed several types of system using femtosecond-laser-excited voxel and holographic beam control with computer-generated hologram. In our systems, a gas-state type which employs air as a screen shows touch interaction applications between user and graphics, and also demonstrated augmented reality in real 3D space. However, this system still has a challenge to display color graphics because the color of the aerial voxel is monochromatic bluish white. In this research, we try to form the graphics with multi-color by selectively re-imaging light from voxels with only arbitrary colors using two parabolic mirrors including variable color filters.