Dear Meep-users,
I am still looking for a solution for this problem. I would be gratefull
for every tipp!
Thanks a lot!
Stefan
original message:
Dear Meep-users,
I am a bit confused by the units in Meep and hope you can help me to
find the error in my calculations.
I specify the meep length unit a=1µm. Now I want to simulate a laser
pulse with center wavelength lambda_0=750nm and a temporal fwhm length
of t_fwhm=3.5*10^-15s.
Thus I would say in meep units:
f_0_meep=f_0*a/c=a/lambda_0=1/0.750=1.333
and
t_fwhm_meep=t_fwhm*c/a=3.5*10-15*3*108/(10-6)=1.05
Is this right so far?
Now I run the simulation using resolution R=500 and courant factor
default. The dafault factor is S=0.5, right?
Now I want to calculate the temporal distance of the layers in the h5 file.
dt=S*a/(R*c)=3.3333*10^-18s
But when I plot the electric field of the pulse over time now, the pulse
fwhm duration is not 3.5fs, but more like 0.15fs.
Where is my mistake here?
Thanks a lot in advance!
Stefan
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