Measurement of the refractive index of transparent materials using null polarimetry near Brewster's angle

Soe-Mie F. Nee

doi:10.1117/12.326669

8 October 1998 Measurement of the refractive index of transparent materials using null polarimetry near Brewster's angle

Soe-Mie F. Nee

Author Affiliations +

Proceedings Volume 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials; (1998) https://doi.org/10.1117/12.326669
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

The nondestructive measurement of refractive index of transmissive materials using null polarimetry is simple, accurate and does not require much on sample preparation. In null polarimetry, the ellipsometric parameter (psi) for reflection from a sample is measured. (psi) for transparent material is defined by tan (psi) equals r_p/r_s where r_p and r_s are coefficients of reflection for the p- and s-polarization respectively. By choosing the angle of incidence (Theta) near the Brewster angle, refractive index can be computed from (Theta) and (psi) directly. The only requirement on the sample is that no back surface reflection is allowed to mess up the front surface reflection. Precision in the refractive index is about 0.0004. Spectra of refractive index for quartz are measured and compared with the spectra quoted from existing Handbooks.

Citation Download Citation

Soe-Mie F. Nee "Measurement of the refractive index of transparent materials using null polarimetry near Brewster's angle", Proc. SPIE 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials, (8 October 1998); https://doi.org/10.1117/12.326669

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