### Laser Cutting and the Gaussian beam - fx Solver

For a Gaussian beam propagating in free space, the spot size (radius) w z will be at a minimum value w 0 at one place along the beam axis, known as the beam waist. For a beam of wavelength λ at a distance z along the beam from the beam waist, the variation of the spot size is given by this equation on the left. For a Gaussian beam propagating ...