Recently I performed my first Pump-Probe experiment on a sample of cresyl-violet. Leaving out the experimental set up, what I got in output is a matrix whose elements are the Intensities of a single frequency at a single time (time delay between the pump and probe). The graph is:
The signal is clearly chirped, so after performing de-chirping what i obtain is an other matrix called "Signal". Now what i want to get is the Raman spectra. My tutor said me I have to perform a Fourier Transform, so what i did is:
so for each wavelength, I should take the Fourier Transform of the vector and what I get is a complex number (ok I'm performing FFT so nothing strange) but if i plot both real and image part of Signal I get clearly wrong results. What i Should get is something like this:
Can you please help me?