what is rh function related to quarter and half wave plate in topic of polarisation
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1. linearly polarized incident ligth
*after 1/4 wave plate which principal axis is 45 degrees relatively to the incident polarization, you obtain circularly polarized ligth.
*after the 1/2 wave plate you still have circularly polarized but of the other sign, whatever the relative angle between the axis of the first 1/4 wave plate and this 1/2 wave plate.
*The next 1/4 wave plate transforms the circularly polarized ligth into linearly polarized with a direction depending of the direction of the last 1/4 wave plate axis.
Rotating th 1/2 wave plate will have any consequence. This setup is weird because you can obtain the same effect (rotation of the initial linear polarization using only one 1/2 wave plate...
2. The incident ligth is circularly polarized:
*after 1/4 wave plate you have linearly polarized ligth 45 degrees with respect to the principal axis of the 1/4 wave plate
* The 1/2 wve plate rotates the polarization of twice the angle between the axis of the 1/2 and 1/4 wave plate.
*The additional 1/4 wave plate will transform the linear polarization into circular polarization if its axis is oriented 45 degree with respect to the linear polarization.
From that configuration, rotating the 1/2 wave plate by 45 degrees wil change the sign of the final circular polarization.
Hope this will help, kind regards
*after 1/4 wave plate which principal axis is 45 degrees relatively to the incident polarization, you obtain circularly polarized ligth.
*after the 1/2 wave plate you still have circularly polarized but of the other sign, whatever the relative angle between the axis of the first 1/4 wave plate and this 1/2 wave plate.
*The next 1/4 wave plate transforms the circularly polarized ligth into linearly polarized with a direction depending of the direction of the last 1/4 wave plate axis.
Rotating th 1/2 wave plate will have any consequence. This setup is weird because you can obtain the same effect (rotation of the initial linear polarization using only one 1/2 wave plate...
2. The incident ligth is circularly polarized:
*after 1/4 wave plate you have linearly polarized ligth 45 degrees with respect to the principal axis of the 1/4 wave plate
* The 1/2 wve plate rotates the polarization of twice the angle between the axis of the 1/2 and 1/4 wave plate.
*The additional 1/4 wave plate will transform the linear polarization into circular polarization if its axis is oriented 45 degree with respect to the linear polarization.
From that configuration, rotating the 1/2 wave plate by 45 degrees wil change the sign of the final circular polarization.
Hope this will help, kind regards
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