one question~

[jianshuowang]

hello，Why is the envelope of spectralIntensity and spectrum different？I think they're just different on the horizontal axis

[jianshuowang]

plot(p2.wavelengthArray, real(p2.spectrum));
hold on；
plot(p2.wavelengthArray,real(p2.spectralIntensity));

[jianshuowang]

1

[albeco]

Hi Jianshu,

the reason is that the spectral intensity is meant to be plotted vs frequency, while the spectrum is meant to be plotted vs the wavelength. The normalization therefore is different

spectral_intensity(frequency) == spectrum(lambda) * lambda^2 / c

(see e.g. https://www.rp-photonics.com/spectral_quantities.html)

[jianshuowang]

• Thank you very much. ^^