npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Phys.: Sae Mulli 2020; 70: 863-870

Published online October 30, 2020

Copyright © New Physics: Sae Mulli.

Observation of Interference Colors due to Photoelasticity Without Polarizer

Yu CHEN, Hyejung KWAK, Pyung Kang JUNG, Su Jin MOON, Jung Bog KIM*

Korea National University of Education, Cheongju 28173, Korea


Received: June 30, 2020; Revised: July 27, 2020; Accepted: July 28, 2020


The interference colors caused by the birefringence of a photoelastic material were examined for alignments that can be seen without a polarizer. When light enters a transparent plate with photoelasticity at an incident angle, reflected or refracted light is partially polarized, and this process serves as a polarizing plate. Because the refracted light is divided into ordinary light and extraordinary light, that is, linear polarization components perpendicular to each other, the polarization direction is changed while passing through the medium. Because the refractive index varies with the wavelength of light according to the dispersion relation, the degree of change in the polarization depends on the color. This interference color can be measured without a polarizer. In this study, we tried to explore various configurations in which interference color occurs without a polarizer.

Keywords: Interference color, Birefringence, Photoelasticity, Polarization

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