Optical: systems and elements – Optical frequency converter
Patent
1997-01-30
1998-06-09
Lee, John D.
Optical: systems and elements
Optical frequency converter
365151, 501123, 501126, 501904, G02F 135, G11C 1304
Patent
active
057644039
ABSTRACT:
composed of a low-phonon, optically transparent, non-pixelated host material doped with active ions. The display uses intersecting infrared When the ions relax, visible fluorescence is produced. Different points in intersect at different locations within the screen. In one embodiment, 34!. In other embodiments, laser arrays or slab lasers are used to activate points within the screen. Through the use of additional lasers and dopants, multi-color images may be displayed. The doped host 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.
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