re:Non-visible-light/IR focusing lenses-Si, Ge, ZiSe?

From: stevelu (sp_lussier_at_yahoo-dot-com.no-spam.invalid)
Date: 01/15/05 

Date: 14 Jan 2005 19:31:02 -0600

Thank you, Phil.

ZnSe is orange, and ZnS is yellow

That would explain the smell when I took that piece out!

No, seriously. I just saw ZnSe described as yellowish and clear and
part of systems focusing non-visible light, and didn't even know to
look for ZnS - therefore didn't know how to interpret that bit of
informal molecular analysis. Hazards of casual online research.
Just as well I don't have a chunk of Selenium in my garage.

So, what kind of wavelength filtering or other beneficial effect would
one expect to gain from combining a ZnS flat with Si or Ge lenses?

(as you can see, it's too late to follow the advice about not taking
the assembly apart, though I did stop before I had took all the
elements out, and that plus the fact that they are of different
diameters means there's a very good chance I can reassemble them in
original sequence 8^)

So, with the question of Si, Ge, or both still unresolved for now, for
the remainder of the elements, would anyone like to speculate what
this marvelous device might have been intended to do?

a) focus a laser
b) imaging of some kind
c) basic research into fundamental principles of IR optics
d) both a and b
e) both a and c
f) a, b, and c
g) something else
h) "some things man was not meant to know"

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