Talk:Beam diameter

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)

Please wikify

• "electromagnetic beam" in intro; "beam" points to "light beam": is this the correct link? At any rate, the two-words term should be a link, not just "beam".

Thanks in advance.
--Jerome Potts (talk) 02:58, 4 October 2008 (UTC)

Revolution symmetry

" σ is the standard deviation of the horizontal or vertical marginal distribution" -->only valid for beams with revolution symmetry.212.128.173.159 (talk) 10:55, 29 July 2013 (UTC)

No, although the wording was not very clear. The quantity σ is the standard deviation of either the horizontal or the vertical marginal distribution. If they happen to be the same, then D4σ is the diameter of the beam. Otherwise, one evaluates the beam width in separately in two orthogonal axes (horizontal and vertical, or perhaps along the major and minor axes of an elliptical beam). Each axis has its own σ, and its own D4σ.--Srleffler (talk) 01:18, 30 July 2013 (UTC)

Advertisement text?

The section headed Fusing knife-edge technology with imaging reads somewhat like an advertisement, probably for the company mentioned at the end of the section as originally posted. (I deleted that reference.) Rich Rostrom (Talk) 20:31, 23 June 2016 (UTC)

"Half power beam width" listed at Redirects for discussion

An editor has identified a potential problem with the redirect Half power beam width and has thus listed it for discussion. This discussion will occur at Wikipedia:Redirects for discussion/Log/2022 January 6#Half power beam width until a consensus is reached, and readers of this page are welcome to contribute to the discussion. Shhhnotsoloud (talk) 08:32, 6 January 2022 (UTC)