Laser Focusability (Gaussian Beam)

The diffraction-limited focal spot size of a laser beam depends on its wavelength, the size of the beam at the lens and  its M2 value. 
Use this simple calculator to determine your laser's diffraction-limited focal spot size, assuming an ideal lens without aberrations.

 



 Laser Focusability (Gaussian Beam)

Wavelength

(nm) *

Lens focal length

(mm) *

Beam diameter (at lens)

This is the 1/e2 diameter of the Gaussian beam. It's the point at which the power is about 13.5% of the peak power.

(mm) *

M-Squared

*