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Shareware Overload Trio 2
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Shareware Overload Trio Volume 2 (Chestnut CD-ROM).ISO
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dir28
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photonic.zip
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N.TXT
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1993-09-10
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So how does it work? When one input beam is kept on all the time
light exits the hole in the mask when the other beam is off. That is,
the hologram which is lit, focus its light to the single spot image
which is located right in the middle of the mask hole...thus it exits
the transistor through the hole.
When the modulated beam is switched on, destructive interference
takes place at the hole causing the photons to be dispersed elsewhere
on the output square. Since the entire output square is the mask,
and therefore black, it doesn't really matter where the photons land
on the mask. The important thing is that they are blocked anytime
both inputs are on...and exit the hole when only one beam is on.
Most importantly, the process occurs at the speed of light, and
electronic NOT circuits are considerably slower. If fact, one should
note that the inputs to an electronic NOT must remain at constant
states during the entire switching time. That is, the modulated input
must remain on for an entire nanosecond in order for a one-nanosecond
switching electronic transistor to produce a useful output. Not so
with the photonic NOT.