Circular and Elliptic Polarization of Light Waves

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A superposition of two linearly polarized light waves with perpendicular polarization planes results in a linear, elliptical, or circular polarized wave, depending on the amplitudes and the phase shift between the two waves.

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In the animation the electric field components of the two individual waves are shown in red and blue if "show components" is selected. The electric field component of the resulting superposition is shown in green. If the superimposed waves have equal amplitude and a phase shift of a quarter wavelength (), the resulting wave has circular polarization. This is the default setting for the animation. If the phase shift is not equal to , or if the waves have different amplitudes, the superposition wave has elliptic polarization. Adjust "amplitude ratio" or "phase shift" to see the effect. A "detector" at position traces the amplitude of the resulting wave and shows the polarization. The animation can be freely rotated. Select a phase shift of zero or to obtain a superposition wave with linear polarization.

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Contributed by: Jochen Autschbach (March 2011)
Open content licensed under CC BY-NC-SA


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