In optics and especially laser science, the Rayleigh length or Rayleigh range, z R {\displaystyle z_{\mathrm {R} }} , 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.
In optics and especially laser science, the Rayleigh length or Rayleigh range, z R {\displaystyle z_{\mathrm {R} }} , 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.
Source: Wikipedia "Rayleigh length" · CC BY-SA 4.0
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