hello i need help with this questions only thank you An AlGaAs (refractive inde

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hello i need help with this questions only thank you
An AlGaAs (refractive inde

hello i need help with this questions only thank you
An AlGaAs (refractive index n=3.6) laser diode with a 0.3mm cavity operates at 0.82 um and has a 4 nm spectral width. Calculate the frequency spread and wavelength spread between longitudinal. How many longitudinal modes exist?

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