Hello, I am trying to use a custom source alone with the GaussianBeamSource. The custom source is a laser pulse (looks like an up-chirped pulse). Initially, I try to use this custom source without specifying the 'fcen'. However, the field will diverge. This issue was fixed by assigning a 'fcen' argument. Since the chirped pulse changes the frequency over time, what should be the correct 'fcen'? Also, the 3D shape does not look like a beam when rotated(please see the following picture). Did I do something wrong? Any help would be appreciated.
[image: g.JPG]
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