During synthesis of glasses I get samples with opaque structure. I need to measure the refractive index of that samples in visible or infrared region. What is the method that can be used to measure the refractive index of the opaque glass samples?
Dear Hima:
In case of opaque samples you can measure the refelictivity, R, against wavelength in the required spectral range using double beam spectrophotometer. Using Kramers-Kronig method you can calculate n and aslo k of the opaque sample.
It should be noted that solution of Kramers-Kronig ralation soft ware is available on most used spectrophotometers. Furthermore I can send you the mathematical solution of these relation via my e-mail:[email protected].
With my best regards
Prof. Fathy Abdel-Wahab
@ F.A. Abdel-Wahab
Thank you for your kind response sir.
Please Send me the mathematical solution to my mail [email protected]
@ Lukas Strizik
What could be the maximum thickness of the glass sample to measure refractive index by spectroscopic ellipsometer
@Lukas Strizik
My glass samples are having the thickness of about 1mm. Sometimes finding thickness is also difficult. We are having the spectroscopic ellipsometer in our lab. But I don't have Idea to find the refractive index for the glass samples through it. what are the steps involved in aligning the ellipsometer to find the refractive index. Please share me the necessary steps to find it.
The relation for Energy band gap and refractive index was given by Dimitrov and sakka(1996) and this equation can be used to find the refractive index of the glass samples if we know the energy band gap which can be calculated by UV-Vis spectrometer data of the samples
U can try this also....by knowing the dielectric constant of ur materials....
refractive index n = sqrt of (material's relative permittivity * relative permeability)
@Balaji: How to find the relative permittivity of the glasses at optical wavelength of radiation?
generally we measure dielectric properties of the glass in the range say 50 Hz to 5MHz. and this range will not fall in the optical wavelength region useful to us. Its a rough estimataion and relation between permitivity and refractive idex again as said it is frequency dependent. If you want to measure RI at a perticular wavelength you have to use the abbe refractometer or ellipsometer or prism coupler.
Very useful information Dear Balaji. Thanks. dielectric measurements done for the samples will not be useful as they are done at different frequencies other than for optical frequency region.
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