How to calculate refractive index from reflectance values

[Mythili]

Greetings.
how to calculate the refractive index, extinction coefficient, absorption coefficient values from the reflectance data. And also suggest me how to measure the transparency of glass. Is there any relation between transparency and refractive index

Thanks in advance

 

[Simon Bridge]

Welcome to PF;
Concentrating on refractive index:
i.e. http://www.kayelaby.npl.co.uk/general_physics/2_5/2_5_9.html

But it can depend:
http://scitation.aip.org/content/aip/journal/apl/96/23/10.1063/1.3449127

... what level is this to be done at?

 

[Claude Bile]

Not possible using only intensity measurements to my knowledge - you need to know the phase change upon reflection as amplitude to calculate the complex (i.e. refraction + absorption) refractive index.

Extinction and absorption coefficient are basically the same thing, transparency additionally depends on the thickness of the material you are looking at. Absorption coefficient is related to the imaginary component of the refractive index.

Claude.

 

[chris167]

Hi,
do you know how i can calculate the phase shift of measured reflectance data? I find the dispersion relation formula but I can´t solve it.
A step by step description will really help.

thanks
chris