Talk:Optical autocorrelation
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I do not exactly know what to do to tell the author about the error; it is not easy to correct it as it would involve amending the figure. Namely, on the first figure (field autocorrelation, http://upload.wikimedia.org/wikipedia/en/thumb/d/d6/Optical-field-autocorrelation-setup.png/400px-Optical-field-autocorrelation-setup.png), the beamsplitter is reflecting the beam the wrong way; it should reflect it towards the scanning mirror first rather than to the detector. So, what author should do about it is rotate the beamsplitter 90 degrees. Just it. Lukkor 19:56, 19 November 2006 (UTC)
I have just noticed the same problem about the next setup figure.
--Lukkor 20:52, 19 November 2006 (UTC)
There is another thing: the author creates the impression that second-order autocorrelation called here "intensity" or "interferometric" autocorrelation must be measured with a nonlinear crystal; it is wrong - a two-photon photodiode is sufficient and the experimental setup is just identical, with a different kind of a photodiode, that is detector. I do not really know how to include this into the article as there are many remarks about these measurements being more difficult.
--Lukkor 21:36, 19 November 2006 (UTC)
There should be no distinction between "field", "interferometric" and "intensity" autocorrelation; instead, there should be "first order" and "second order" autocorrelation. The "second order" coming in two flavours, "intensity" or "interferometric" what depends on the speed of scanning and presence of beams overlap. The first order, field autocorrelation is always "interferometric".
--Lukkor 21:36, 19 November 2006 (UTC)
