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Gaussian spot profile

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Gaussian spot profile diagram
calc
This calc uses the 2d Gaussian function to determine power density as a function of position in a gaussian beam of known total power.
Size FWHM
Beam power
Wavelength
Radius r

Peak power density
Power density at r
Photon flux at radius r
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notes
Beam sizes are most commonly measured as FWHM diameters. The "beam width" as defined by a drop of intensity to (1/e) can be converted to FWHM by multiplying it by ~0.85.