Light Reversability and other technical stuff

[Garry H (Cut Nut)]

I have been having an interesting discussion with Bruce Harding (Beryl), Anton Valsiliev (another genius from Moscow) and Michael Cowing.

I hope to attract the discussion here so that others can enjoy it and it will also be archived because there is the possability that it will lead to some breakthroughs in understanding of light and the human perception of it concerning gem stones.

here is one quote from Anton - out of context :
"I''m sure that beauty can''t be measured. I understand, some vendors of diamonds want to measure it, but I don''t want to help them. What do you think about any man, who calculates the beauty of Rembrandt''s picture by means of investigation of color distribution on it? (too dark and many
brown)"

 

[Toska]

Using Rembrandts painting as an example of beauty in comparison to a diamond is like comparing apples and oranges. Some things such as diamonds benefit from scales when measuring the beauty, unless you want a stone that looks like a piece of glass.

 

[dymonite]

Hi Garry,

Didn't we go through this several months ago on another forum?

http://www.diamondtalk.com/forums/showthread.php?threadid=24462&goto=newpost

I also recall sending you some pics I did on diamond calc showing a similar stuff.

Have you further thoughts on this 'non-reversibility'?

Dymonite

 

[strmrdr]

I don’t have time to read the entire dt thread this morning but read the first few pages. That noted.

From my studies of lasers in college the biggest problem in predicting what light will do in a crystal and trying to duplicate it by a computer program is that light does "weird things".
We do not fully understand all the interactions of light with various materials and sometimes something we cant even yet measure at a very low level in the material will throw the results off.
This when designing real world optics while the computer generated results will give you a starting point it will not get you to your destination.

This is a huge problem with light that is concentrated in one wavelength and broad spectrum light only make the effect worse because the different wavelengths will react differently.

This can be demonstrated in crystal structures by hitting them with
closely controlled light of different wavelengths and measuring the results.

When it comes to consumer diamonds it gets even harder because you are not talking about carefully controlled material as far as ri and color absorption are concerned.

For example cut 2 diamonds optimized to get the desired effect with a chosen wavelength and they will NOT react the same because of the differences in the base material itself.
Even if they are cut from the same block of material this holds true.

Is an age old problem of calculation versus the real world.
Guess what the real world wins :}

 

[strmrdr]

To take this one step forward.
Your diagrams above are they d or i color diamonds and what is the wavelenths of the light?
Changes in either will throw off the results from what you presented.
In the real world these differences must be accounted for.
For example buy some "white" leds 99% of which have a nasty blue shift in the light output now take and view a real world example of what you presented under it, now repeat the test using a argon light source and again with halagen and yet again with sunlight.
Then repeat with a d color diamond and an I color diamond for each liht source.
All of the sudden your diagram doesnt seem so accurate does it? :}