Laser aperture transmission calculator

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About this calculator

This calculator computes the fraction and absolute power of a Gaussian laser beam that passes through a circular aperture. The transmitted fraction is given by

PP0=1e2a2w2\frac{P}{P_0} = 1-e^{-\frac{2a^2}{w^2}}

where aa is the radius of the aperture and ww is the 1/e21/e^2 beam radius at the aperture. The total transmitted power can also be computed if the incident power P0P_0 is known.