How Can Optical Devices Like QWP and HWP Determine the Polarization of Light?

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Discussion Overview

The discussion focuses on how optical devices such as quarter wave plates (QWP) and half wave plates (HWP) can be used to determine the polarization of light, specifically distinguishing between right and left circularly polarized light. The scope includes theoretical explanations and potential applications of these optical devices.

Discussion Character

  • Exploratory, Technical explanation

Main Points Raised

  • One participant suggests that sending circularly polarized light through a QWP results in linearly polarized light, with the orientation depending on the QWP's alignment and the original polarization of the light.
  • Another participant explains that when circularly polarized light passes through a QWP, it becomes linearly polarized at 45 degrees to the fast axis, indicating that if the polarization plane is to the left, the original light was left circularly polarized.
  • A participant asks for clarification on the application context, inquiring whether the light source is a laser or something else.

Areas of Agreement / Disagreement

Participants present various methods and explanations for determining the polarization of light using optical devices, but there is no consensus on a single approach or application context.

Contextual Notes

Some assumptions about the light source and specific configurations of the optical devices are not fully addressed, which may affect the applicability of the proposed methods.

pmehnati
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Hi,
how we can determine the right or left circularly polarized light by using the optical devices such QWP or HWP or others.
 
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If you send circularly polarized light through a QWP it becomes linearly polarized in a direction that depends on the orientation of the QWP and whether the light was left or right circularly polarized. Then you can send the linearly polarized light through a polarizing beamsplitter. When the QWP is oriented properly, one beam from the beamsplitter corresponds to the left circularly polarized part of the original light, and the other to right circularly polarized part of the original light.
 
Send it through a quarter wave plate. It will come out linearly polarized at 45 degrees to the fast axis (taken as vertical). If the plane of polarization is the the left as you look toward it, the light was LH circular polarized.
 
pmehnati said:
Hi,
how we can determine the right or left circularly polarized light by using the optical devices such QWP or HWP or others.
Can you describe your application? Is this for laser light, or is the source of light something else?
 

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