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Measurement of the Gaussian laser beam divergence.

z* means the distance from the beam waist to the position where the gradient of the beam radius locus has the value 0.99 θ( ∞). The beam divergence is usually obtained by measuring the gradient of the beam radius along the beam axis. So, to obtain the correct beam divergence with this method, the beam radius at a position far from z* must be measured. Figure 2 shows the relation of z* vs beam waist radii in the case Fig. 1. Profile of a Gaussian beam.