X-Message-Number: 18905
From: 
Date: Tue, 9 Apr 2002 15:15:16 EDT
Subject: brain reader # 3

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Brain reader: The optical laser system.

Two years ago, on that same subject I had described a two stages system: The 
first would have been a chemical laser and the second a dye system pumped by 
the first. The new possibility to use holographic mirrors to entangle photons 
wipe out the dye laser stage. Because that one has an efficiency in the 0.2 
percent range, the power output of the first and sole stage is divided by 500.

That put into question the use of chemical lasers. These use exotic fuels 
such deuterium burning in fluorine or iodine oxidizer.  These products are 
hard to find, costly or very costly, very toxic and are used in military 
devices. Not a good thing when an authorization to use them is mandatory or 
when informations on the subject is called for.

Now, the reduced power allows to move to metal vapor lasers, a technology far 
simpler an right now in the public domain. Amateurs have built such system 
with 10 kW near continuous output. The pumping power is electric, not 
unstable chemical molecules in shock waves.  The efficiency is high: Up to 20 
percent. It seems the only limit found by amateurs in that technology is the 
availability of large surplus high voltage transformers. Outside Las Vegas, 
it seems the largest neon adds use only up to 50 kW and so, larger 
transformers are hard to find.

One solution is to build a large coil with a fast circuit breaker. Extracting 
mega-watts with that device from the main would pose some problems, so a 
specific electric generator must be used. In the chemical laser version, the 
thermal burner had a power in the 300 giga-watts range (ten Space Shuttles at 
lift off to give an idea). Here, we are only in the 600 MW domain, with half 
that in electrical form using magneto-hydro-dynamics open cycle conversion 
and 120 MW in the laser beam.

At first, these values seem enormous, in a way they are. On the other hand, 
these devices must work only some seconds at a time, not in a continuous way 
as is the case for a power plan.

Burners in the 20 MW domain can be found at "low" cost, talks will start 
shortly for a 600+ MW unit.

Yvan Bozzonetti.





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