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Information is stored digitally in an optical storage system at room temperature by changing the lifetime of luminescence from material in a region of small spatial extent.
English (United States)
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Optical Information Storage by Spatial Lifetime Hole Burning
Information is stored digitally in an optical storage system at room
temperature by changing the lifetime of luminescence from material in a region of
small spatial extent.
As shown in the drawing, the optical storage system 10 has an ultraviolet
light source 12, for example, a mercury lamp, which emits a beam of light that
passes through lens 14, shutter 16, chopper 18, lens 20 to region 19 in
luminescent layer 22. The chopper may be a rotating disk with holes operating
with a low duty cycle.
The luminescent layer 22 is of a material such as europium benzoyl-
trifluoroacetone pyrrolidinium which can have its lifetime altered by the irradiation
of different intensities. The layer 22 is positioned on a substrate 24, such as
glass. A lens 26 and a detector 28 are used with electronics (not shown) to
determine the fluorescence of the region 19.
The light beam from source 12 changes the fluorescence lifetime T=T(o) to
T(1). One bit of information is 1 when T=T(1); one bit of information is 0 when
T=T(o). During the writing step the chopper 18 is always open. During the
reading step the chopper 18 is working with a low intensity.
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