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Beat Frequencies & Light

by hks85
Tags: beat, frequencies, light
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hks85
#1
Mar11-08, 08:06 AM
P: 10
I know how beat frequencies work with sound. I know they exist in RF so how do they affect light?
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mgb_phys
#2
Mar11-08, 08:30 AM
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The difficulty is that they need a medium to mix in.
Light doesn't interact with light in air or vacuum (at sensible power levels)

A radio uses beat frequencies to mix the received signal with a carrier in a diode, I can't think of a similair substance for light.
Andy Resnick
#3
Mar11-08, 11:51 AM
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P: 5,523
I think it can be done optically using a master oscillator, as a way to stabilize a resonant cavity. Not sure about the equipment- a photodiode of some sort, most likely.

Claude Bile
#4
Mar11-08, 06:36 PM
Sci Advisor
P: 1,477
Beat Frequencies & Light

You can generate difference (beat) frequencies by mixing optical signals in a second-order nonlinear medium.

Claude.


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