Beam Parameter Product

Product of the Beam Radius in a focus and the far-field beam divergence.

The beam parameter product of a Laser beam is defined as the product of beam radius and the Beam Divergence half-angle. The usual units are mm mrad (millimeters times milliradians). The beam parameter product is often used to specify the Beam Quality of a laser beam: the higher the beam parameter product, the lower the beam quality.

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