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Laser Beam Geometry Tool

Calculate Rayleigh range and divergence for your laser module. This tool uses Gaussian beam optics to simulate how the spot size transforms as it moves away from the focus.

Learn the theory behind it in our article Laser Focus Geometry.

Focal Spot Diameter
($2w_0$) [mm]

Wavelength
($\lambda$) [nm]

Beam Quality
($M^2$)

Max Distance
($z$) [mm]

Rayleigh Range ($z_R$) -- mm

Divergence ($\theta$) -- mrad

$z$ [mm]	Spot Size [mm]