Double polarization of crystals

[Gilles Benoit]

This is my first post. I recently started experimenting with double polarization of crystals after reading an article by Robert Berdan.
I appreciate your comments and suggestions.
Gilles

1.Vitamin C crystals, double polarization, Nikon D750


2,Beta-Alanine & Glutamine Crystal, double polarisation, 20X, Focus stacking. Nikon D750


3. Beta-Alanine & Glutamine Crystal, double polarisation, 20X, Focus stacking. Nikon D750


4.Crystal double polarization, Focus stacking, Nikon D750, Mikaton 20mm lens + Extension Tube


5. Glutamine Crystal, Double polarization, Focus Stacking, 40X, Nikon D750


6.Vitamin C Crystal, double polarization, Focus stacking, Nikon D750, Mikaton 20mm lens + Extension Tube

[Pau]

Hi Gilles, welcome aboard!

They are very nice colorful images.

I'm curious about your use of the term "double polarization", I think that the right expression is crossed polarizers: your images seem typical of the use of a polarizer under the subject and another polarizer called analyzer over it.
Double polarization or dual polarization is another concept, much more arcane for non physicists like me.

[Gilles Benoit]

Thank you, Pau
I appreciate the clarification on crossed polarization.