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Mark Sylvester wrote:
I recall hearing (on this list, I believe) that one can detect
optical beats by illuminating a photodiode with lasers of slightly
different frequency. The beat signal is detected electronically.
Could someone recall the details?
In the general case, there's not much to add.
But let's look at a particular case that shows
why this is not just possible but important.
Illuminate the diode with two beams. One is the