Dynamic volumetric displays enabled by tunable upconversion in rare-Earth-doped glasses

https://www.eurekalert.org/news-releases/1074231

"3D images using volumetric pixels (voxels) do not need head-mounted devices/ complex visual tricks... laser-based enable vivid colors, high contrast ratios, now overcome low resolution, ghost voxels, absence of tunable, full-color emission in single material... RE3+-doped monolithic glasses (RE = Ho, Tm, Nd, Yb) tunable full-color emission under near-IR... leverages rare-earth ion optical properties in glass matrices... high optical transmittance, thermal/ chemical stability, low phonon energy, superior mechanical strength"