Rayleigh range ( confocal parameter)


In optics and especially laser science, the Rayleigh length or Rayleigh range is the distance along the propagation direction of a beam from the waist to the place where the area of the cross section is doubled. A related parameter is the confocal parameter, b, which is twice the Rayleigh length or depth of focus

Related formulas


bDepth of focus (confocal parameter) (m)
w0The waist size (m)
λThe wavewidth (m)