Next, take the arc tangent of that value and then multiply by 2 to get the laser divergence. To calculate the divergence of a laser, subtract the diameter at point f from the diameter of the beam at point i, then, divide by 2 times the distance between the 2 points. To measure the Beam Spot size and Beam Divergence of a Laser beam using a detector in various ways. If you’re using an optical instrument, such as an optical collimator, that requires a collimated beam of light, you have to make sure that the laser beam has low divergence. Heres one of the most essential tools for assessing the basic laser display safety and MPEs. A laser beam that has low divergence could be said to be “collimated”, which means it will maintain a narrow beam as opposed to spreading out. Laser divergence is the measure of the angle of a laser beam’s spread. To calculate the laser divergence, take the arc tangent of the difference between the beam diameters at each point over 2 times the distance between point, then multiply by 2. L is the distance between point f and point i.
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