Interference between different mode of light

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Discussion Overview

The discussion revolves around the potential for interference between different modes of light, particularly in the context of fiber optics. Participants explore theoretical and practical aspects of light modes, wavelengths, and their behavior when combined and separated in optical systems.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions whether two different light modes focused onto a single spot could interfere.
  • Another participant suggests that theoretically, interference may not occur, but practically it could, citing their study of combining different wavelengths in fiber optics and the associated distortion.
  • A participant seeks clarification on what is meant by "different light modes."
  • One participant defines "mode" in the context of fiber optics, specifically mentioning a two-mode fiber.
  • Another participant initially interprets "different light modes" as referring to "frequency," expressing confusion over the terminology used.
  • A later reply clarifies that the discussion is likely about multimode fiber and asserts that different modes can indeed interfere.

Areas of Agreement / Disagreement

The discussion contains multiple competing views regarding the definition of "light modes" and whether interference occurs, indicating that there is no consensus on these points.

Contextual Notes

Participants express uncertainty regarding the definitions of terms and the mechanisms of interference, highlighting the complexity of the topic and the potential for distortion in practical applications.

watertreader
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Hi,

If I have two different light modes focused onto a single spot, could they interfere?

Thanks
 
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Theoretically I think the answer is no, practically, they could. I'm just studying how different wavelengths of light are combined and sent down a single fibre optic cable, then split using gratings at the other end into separate wavelengths again. This is allowed but there is some distortion associated with the method. I don't know the details of the mechanisms though.
 
What do you mean by "different light modes?"
 
hi,

I am thinking of mode as in the mode in fiber...specifically toying around the idea of a two mode fiber
 
I assumed you meant "frequency". Your explanation of "different light modes" makes me even more confused as to what you mean!
 
I believe he's just referring to multimode fibre. And yes the different modes can interfere.
 

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