Abstract
Efficient up-conversion emitters are necessary to generate a
full-color 3D display. Rare-earth, co-doped fluorides that efficiently
convert near infrared diode laser emission to visible red, green,
and blue light by sequential two photon absorption are necessary to
accomplish this. An up-conversion medium for a 3D display, particularly
the CSpace “static volumetric display,” can be fabricated
by grinding rare earth-doped fluoride bulk crystals and then dispersing
the resultant microcrystals within an index matched host. This in
turn leads to a reduction in display cost, weight, and growing time,
as well as facilitating display scalability. To demonstrate a scalable
medium for the CSpace display, several rare earth-doped fluoride bulk
crystals were ground into micro crystal powders and then dispersed
in liquids of different refractive index, including 1.45, 1.456, 1.46,
1.464, 1.468, 1.47, 1.474, 1.476, 1.48, 1.484, and 1.49. Fluorescence
strength and transmission measurements were taken. Different particle
concentrations were tested and demonstrated as well, and the detailed
experimental results are described. A real volumetric 3D image was
constructed inside a prototype display medium of
${{40}}\times {40}\times
{10 mm}^{3}$
using the CSpace display. A potential
future solution is presented, and suggestions to improve the scalable
medium are given.
© 2014 IEEE
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