Is Natural Unpolarized Light Equivalent to Randomly Fluctuating Elliptic Light?

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Discussion Overview

The discussion centers on the characterization of natural unpolarized light and its equivalence to elliptic light with randomly fluctuating properties. Participants explore the theoretical implications of representing unpolarized light through different models, particularly focusing on the components of polarization and their fluctuations over time.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant proposes that natural unpolarized light can be represented as a sum of two orthogonal, linearly polarized components with a randomly fluctuating phase difference.
  • Another participant suggests that this representation could also be viewed as elliptic light, where both ellipticity and tilt angle must fluctuate, raising a question about the necessity of this added complexity.
  • A different viewpoint argues that it is sufficient for the ellipticity to fluctuate without requiring changes in the tilt angle, asserting that this still results in randomly polarized light.
  • One participant challenges the idea that a fixed orientation angle of the ellipse allows for complete randomness in the light's polarization state.

Areas of Agreement / Disagreement

Participants express differing opinions on the necessity of the tilt angle fluctuating alongside ellipticity, indicating that multiple competing views remain unresolved regarding the characterization of natural unpolarized light.

Contextual Notes

The discussion highlights the complexity of defining the properties of light, with participants noting potential limitations in their assumptions about polarization states and the implications of fixed versus fluctuating parameters.

Niles
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Hi

We can represent natural unpolarized light as a sum of two orthogonal, linearly polarized components with a randomly fluctuating phase difference. Is it correct to say that this is equivalent to representing it as elliptic light, where the ellipticity fluctuates randomly in time?


Niles.
 
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Interesting. I suppose you could, since the electric field vector can be decomposed into two orthogonal elliptical states. You would have to allow not only the ellipticity but also the tilt angle to fluctuate- why the extra complication?
 
Andy Resnick said:
Interesting. I suppose you could, since the electric field vector can be decomposed into two orthogonal elliptical states. You would have to allow not only the ellipticity but also the tilt angle to fluctuate- why the extra complication?

I was just wondering, no specific reason. But I don't agree with you, when you say the tilt angle has to change as well. When I look at E traversing an ellipse, which has a randomly fluctuating ellipticity ratio -- then that looks like randomly polarized light to me. No need for the angle to change as well.
 
Even if the ellipticity changes randomly, if the orientation angle of the ellipse is fixed then it is not completely random. (If I correctly understand what you are saying.)
 
I see your points, thanks for helping!Niles.
 

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