Beam divergence calculator4/9/2023 ![]() The dimmest light visible to the naked eye in perfect darkness is around one ten-billionth of a watt per square meter. If you didn’t make a mistake in your calculations and kept everything in radians, watts and meters, the final number should be in watts per square meter. Π × (Beam divergence in radians × Distance) 2įinally, the brightness at the destination is given by dividing the output power of the laser over the area of the spot. Then a little bit of geometry will give us the size of the final lit spot at the destination. (The laser's wavelength)/(π × The laser's aperture) First, if we assume the laser is optimized so that its spreading angle is at its theoretical minimum, then we can calculate its beam divergence (in radians) using this equation. One only needs three rather simple equations for all the calculations done in this article.
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