Kenneth Lerman wrote: > Mounting two detectors in quadrature will be a bit of a problem since the > distance betweeen them will need to change depending on the temperature > (although off hand, I haven't checked to seem how much). At any rate, > though, that's just a matter of engineering. The standard scheme is you convert to circular polarization with a retardation plate, and then analyze the mixed signal with a beam splitter amd a pair of linear polarizers for the two sensors. You get a quadrature relationship between the intensities in the sensors, without any critical positioning.
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