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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: "How the Intelligent Chip Works - The Definitive Explanation" or... posted by Steve Eddy on May 24, 2005 at 22:12:27:
This "technical" explanation is so wrong in so many ways. All I will cite is one pertinent quote and the source:The majority of EIT experiments are carried out in gaseous media, rubidium [44], caesium [63],
hydrogen [64] and the like. For many applications, however, the ability to carry out EIT in solid
materials would be beneficial (see for example section 1.4.3.3 on slow light) particularly if we
wished to take EIT ‘into the field’. However in considering solid materials we run into problems.
The question can be put as follows: Can EIT be used to realise X-ray vision? The answer is no.
The major problem lies in the very broad linewidth transitions and/or the large dephasing rates
that occur in solids. In EIT we require a coupling laser field strength rivalling the probe transition
linewidth. For this to occur in solids we would require laser strengths that would burn a hole
through the material. Not quite what we mean by X-ray vision! Some of these problems can be
circumvented by cooling the sample down near to absolute zero. This has resulted in the
observation of EIT in several solid materials. The first demonstration was carried out in ruby [65]
by Zhao et al and is also notable for the fact that the coupling field in this experiment was a
microwave field rather than an optical field, but this particular experiment has been somewhat
disputed. Other similar experiments have been carried out by Ichimura et al [66] and by Ham et
al [67]in Pr 3+ :Y2SiO5. This second group, who are at MIT, have carried out a number of
experiments investigating enhancement of four-wave mixing in solids due to EIT [67], the
possibility of optical data storage using EIT in solids [68, 69], gain induced by rf fields [70] and
line-narrowing effects useful for spectroscopy [71].
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Follow Ups
- total and complete nonsense - tunenut 16:31:55 05/25/05 (0)
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