Dear Meep Users,
I want to ask a basic question from all of you. I want to illuminate
my object with a broadband pulse. The wavelength range is from 0.5 to 0.9
micrometers. Here i have chosen lambda = 0.7 i.e. lambda=(0.5+0.9)/2=0.7.
And the pulse width in wavelength is d_lambda = 0.4, i.e. d_lambda=0.9-0.5=0.4.
Now, i want to change the above calculations into frequency which is given
below.
fcen = 1/lambda = 1/0.7 = 1.4285.
Now to change d_lambda (pulse width in wavelength) into df (pulse width in
frequency), i did the following calculations.
we know that
f = c/ lambda
take the derivative
df / d_lambda = - c / lambda^2
df = d_lambda x ( -c / lambda^2)
now putting values
df = 0.4 x (1/0.7^2) = 0.816.
Please tell me that are the above calculations correct?
Thanks in advance.
Best Regards,
H J
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