Talk:Beam diameter

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I believe it is possible to convert the different definitions in the case of Gaussian beam profiles. I think this is valuable to mention. As far as I can see it is as follows for the first three definitions:

\frac{1}{e^2}= D4\sigma=\frac{2 \mbox{FWHM}}{\sqrt{\log{4}}} Paul (talk) 14:48, 9 April 2008 (UTC)