Calculation method of laser divergence angle

April 10, 2015 All Posts, Civil Laser

Firstly, adjust the laser light to parallel light
to measure distant light spot and light spot at aperture

Divergence angle =2arctan ((spot diameter- beam diameter at aperture) / 2 / distance) * 1000All units are mm

For convenience’s sake, you can use the following simple formula
(spot diameter (mm) – beam diameter at aperture (mm))/ distance (m)

Note: the above formula adopts the radian calculation result, the unit is mrad, if using the angle calculation result, please take ×π/180 as the unit
If it is 445nm laser, as all spots are rectangular and have big divergence in ⊥ direction, the beam diameter at aperture is the short side to measure spots at aperture while the beam diameter at aperture is the long side, the same for 635nm laser

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