I also want to ask the same question. 1, In the definition of the pulse width in gaussian-src, (fwidth df), does df is bandwith of the gaussian pulse? 2, Is the bandwidth FWHM of the pulse in frequency domain? or the width which is 1/emaximum ? 3, Is the bandwidth the band of electric-magnetic field (such as Ez, Hz)? or the band of energy field (E*D/2)?
At 2010-10-31 12:59:20，"Marco Zocca" <s081...@fotonik.dtu.dk> wrote: >I think there is a slight inconsistency in the definition of the pulse width >in gaussian-src. > >The manual states ( >http://ab-initio.mit.edu/wiki/index.php/Meep_Reference#source) that the width >enters as the standard deviation of the Gaussian, but if one records the >spectral flux a couple of lambdas from the source (i.e. where the nearfield is >negligible), one notices that the bandwith is noticeably smaller. > >In fact, it seems to me that the width is the 6-sigma bandwidth, and that it >is the WHOLE spectral window recorded by the flux sensors that is specified by >the "width" parameter. > >Has anyone noticed this? Or perhaps someone can offer an explanation? > >Thank you in advance and kindest regards, >Marco Zocca >
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