초록 ▼

Three-dimensional objects are displayed in real time within a solid volume of optically transparent material by utilizing two infrared laser beams of different wavelengths to create visible light inside the display material via a two-photon upconversion process. Objects comprising points, lines, sur

Three-dimensional objects are displayed in real time within a solid volume of optically transparent material by utilizing two infrared laser beams of different wavelengths to create visible light inside the display material via a two-photon upconversion process. Objects comprising points, lines, surfaces, and volumes are drawn by decomposing them into a set of small three-dimensional cells or "voxels" located at specific coordinates inside the display medium. Individual voxels are addressed and activated by intersecting the two invisible infrared laser beams at the appropriate coordinate locations. The display material is tailored to provide efficient upconversion in the region of intersection, with minimal visible light generated outside this region by either one of the infrared beams alone. Typical media are rare-earth-doped glasses or crystals having low phonon energies. The general methods for selecting and producing the display material, along with a plurality of system configurations for addressing the display, are disclosed.

대표청구항 ▼

[ I claim:] [1.] A three-dimensional display, comprising:a plurality of voxels in an optically transparent medium, the optically transparent medium including a host material, and a dopant material wherein:voxels in the plurality of voxels emit visible radiation in response to absorption of photons o

[ I claim:] [1.] A three-dimensional display, comprising:a plurality of voxels in an optically transparent medium, the optically transparent medium including a host material, and a dopant material wherein:voxels in the plurality of voxels emit visible radiation in response to absorption of photons of a first wavelength and photons of a second wavelength wherein photons of the first wavelength excite electrons in voxels in the plurality of voxels from a ground state to an intermediate state, and photons of the second wavelength excite electrons in voxels in the plurality of voxels to a higher energy state.