Utilize our Laser Beam Divergence Calculator to quickly determine the angular spread of your laser beam. Essential for optical system design, free-space communication, and understanding beam propagation, this tool helps engineers and researchers evaluate beam performance accurately by simply inputting initial and final beam diameters and the propagation distance.
Formula:
The full-angle laser beam divergence (θ) is calculated using the following practical formula:
θ = (D2 - D1) / L
- θ: Laser beam divergence (in radians)
- D2: Beam diameter at the second, more distant measurement point
- D1: Beam diameter at the first, closer measurement point (e.g., at the source or aperture)
- L: Distance between the first and second measurement points
Important: Ensure that all input units for D1, D2, and L are consistent (e.g., all in millimeters or all in meters) for an accurate result in radians.