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I have an ordinary light (not laser) collimated to produce a parallel beam. After travelling a distance in air, the beam has diverged significantly. The intensity decreases as the radial distance increases. Now I need to estimate the intensity profile along all radial distances inside the beam. All what I found was about laser beam and Gaussian beam, it is not the same thing. Could anyone please show me what theory and which formula I need to use?

Thank you in advance!