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John Oreopoulos wrote:

> Can anyone tell me the refractive index of mica or point me to a 
> reference that states it's value? I'm using mica substrates made by SPI.

http://www.newi.ac.uk/BUCKLEYC/light.htm lists the refractive index of 
mica as 1.561.  However, 
http://hypertextbook.com/physics/waves/refraction/ lists mica as being 
birefringent, and moreover, as having different indexes of refraction 
depending upon the particular type of mica.

Bailey and Kay (Br. J. Appl. Phys. 16 39-44, 1965) describe a method for 
measuring the index of refraction of mica and give values varying 
between 1.602 and 1.617 for muscovite mica, depending upon the exact 
method.  A .pdf is available at 
http://www.iop.org/EJ/abstract/0508-3443/16/1/307 .

Good luck!

Martin Wessendorf

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