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Author Topic: Weird Science  (Read 2566 times)

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AGelbert

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Re: Weird Science
« Reply #75 on: April 18, 2017, 05:56:41 pm »
What is Laser Cooling?     

This video will introduce you with the a laser cooling lab. The working and cooling of hot air up to absolute zero is also shown here.  :o 

http://www.dnatube.com/video/29076/What-is-Laser-Cooling

Agelbert NOTE: This is a BIG deal. WHY? Because, as much as I hate to admit it, this provides a way to escape the temperature effects (but NOT the ocean acidification effects!) of global warming.

This counterintuitive process gives the appearance of violating the second law of thermodynamics because it uses laser energy to COOL a gas or liquid.

Quote
The German scientist Rudolf Clausius laid the foundation for the second law of thermodynamics in 1850 by examining the relation between heat transfer and work. His formulation of the second law, which was published in German in 1854, is known as the Clausius statement:

Heat can never pass from a colder to a warmer body without some other change, connected therewith, occurring at the same time.
https://en.wikipedia.org/wiki/Second_law_of_thermodynamics

But laser cooling doesn't violate the above law, of course. ;D  So, how does it work it's magic of cooling, instead of heating, while ADDING energy to a system? ???

A tuned set of lasers is fired at a gas or a liquid. This uses energy. BUT the targeted gas or liquid does NOT heat up in this case; it RADICALLY COOLS!

Temperature is, as everybody knows, just a measurement of how fast the atoms/molecules are moving around in a given 3 dimensional space. Faster moving atomic mass is hotter while slower is cooler. Absolute zero temperature is full atom stop (in theory  ;)).

The trick is making use of a weird property of photons which enables them to have momentum WITHOUT mass. The photons hit the target, transfer their momentum (but no mass) and SLOW the molecules down, making them real cold real fast.

The casual observer will scratch his head   and ask WHY the momentum doesn't make some of the atoms/molecules go faster (by hitting them from behind instead of head on), since molecules are going in every which way all the time. ???

I mean, shouldn't it all sort of even out?     

NOPE.

THAT has to do with photon frequencies. All atoms/molecules have absorption frequencies. A CO2 molecule will absorb high energy photons (UV band) and emit lower energy photons (IR band) which cannot get out of the earth's atmosphere. That's how global warming got going.

Well, the tuned laser photons (in the video below, they mention using six of them in GPS satellites for atomic clock cooling) do not hit atoms/molecules going AWAY from them because their frequency enables them to "miss" them (no photon momentum absorption due to Doppler effect frequency difference  ).

Quote
In the process of absorbing a photon, the atom receives a small push, a push in the direction away from the source of light, which is the key to laser cooling.
https://www.learner.org/courses/physics/visual/animation.html?shortname=PHY05_laser_cooling

The end result is billions of molecules slowing down and getting real cold, real quick as a consequence of a teeny tiny amount of laser energy injected to do the cooling.

I hope you realize that this means we will soon have air conditioners that use MUCH LESS ENERGY (look ma, no compressor!). It's painfully obvious that lasers, BECAUSE they shoot ZERO MASS photons (there ain't any other kind of photons  ;D), will require much less energy to cool down a gas than present refrigeration technology.

AND, they won't need any fancy refrigeration gas or fluid. WATER will do quite nicely for an ICE box refrigerator or air conditioner, thank you very much. 

 
Like I said before, THIS IS BIG! 

Leges         Sine    Moribus     Vanae   
Faith,
if it has not works, is dead, being alone.

 

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