fwidth of Gaussian source

[mingoosam]

Hello! When I define a Gaussian source with fcen and an fwidth parameters, does meep build the Gaussian with fwidth as the standard deviation or the full width half max?

[zekishaw]

https://meep.readthedocs.io/en/latest/Python_User_Interface/#gaussiansource

I assume you have looked already but there is info here in the docs on the Gaussian source

[smartalecH]

It may not be clear from the docs, but the source of truth is always the code:

meep/src/sources.cpp

Line 106 in e5f88e5

return exp(-tt * tt / (2 * width * width)) * polar(1.0, -2 * pi * freq * tt) * amp;

So width is the standard deviation of the gaussian.

[stevengj]

Note that width = 1/fwidth