Optical phase detection

  • Thread starter Manchot
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Main Question or Discussion Point

Let's say you have two pulses from the same source, one whose phase is slightly delayed relative to the other one. Now, I know that you can use an interferometer and a balanced detection-type scheme to measure the phase shift (in which case you can be shot-noise limited), but I'm wondering if there's some other method that achieves lower noise floors. I'm not exactly sure what I'm talking about (which is why I'm asking), but I'm thinking about something that exploits a nonlinearity or something.

Or is the shot-noise limitation pretty much fundamental? I know that the statistics of the beam itself is ultimately limited by the uncertainty principle, but does that hold even when the beam is upconverted or downconverted?
 

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  • #2
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Perhaps this question is better-suited for the Quantum Physics forum? If so, could someone move it there?
 

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