I want to calculate the correlation length of a rough surface from the intensity profile of diffuse and specular reflectance from that rough surface.(adsbygoogle = window.adsbygoogle || []).push({});

By fitting with the Gaussian curve, I calculated FWHM of the intensity profile.

Generally it is considered that

correlation length = 2/FWHM

I also found that, correlation length = 2*pi/FWHM

Under what conditions of the rough surface, the correlation length = 2*pi/FWHM

Thanks for any help.

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# Correlation length from intensity profile

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