fitting.rayleigh¶

fitting.rayleigh(x, x0, xR, w0)¶

Waist size of a Gaussian laser beam as function of position along axis.

Parameters:	x (array) – x-position along axis. x0 (float) – x-position of beam waist / focus. xR (float) – Rayleigh length. w0 (float) – Beam waist / spot size in focus defined as $1 / e^2$ - radius of intensity.
Returns:	$f(x) = w_0 \sqrt{ 1 + (x - x_0)^2 / x_R^2 }$ .