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Waveplate is an optic in which the polished faces contain the optical axis.All light incidents normal to the surface are composed of components polarized paralle and peerpendicular to the axis.In such a device,light polarized parallel to the axis will propagate slower than light polarized perpendicular to the axis.As the light propagates through the optic,the phase shift between the two components increases with thickness.The phase shift is called te retardance.The most popular retarders are quarter and half wave.

With an appropriate choice of thickness,any degree of retardance may be achieved at any wavelength for which quartz is transparent.However,the minimum thickness necessary to achieve a mechanically strong part corresponds to several full waves of retardance.

Half waveplate

A half waveplate rotates linearly polaried light to any desired orientation.The rotation angle is twice the angle between the incident polarized light and optical axis.

Quarter Waveplate

When linearly polarized light is input at 45deg to the axis of a quarter waveplate ,the output is circularly polarized,similarly,input circularly polarized light is transformed into linearly polarized light.

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