I have a plot of the power transmitted through a device as a function of wavelength, from 1500 to 1600nm. There is some Fabry-Perot noise, plus I suspect some other regularities. I would like to perform a Fourier analysis of the data, with the final goal of getting a frequency or, better, the cavity length at the origin of any periodicity.
I tried with
Fourier, but I would like to correct for the fact that my scan doesn't start from 0, and I couldn't find anywhere the answer to that question. Moreover, I know that the Fourier transform will live in k-space, but I am having some problems in moving to a frequency space.
Can anybody give me some hints?