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Encyclopedia of Laser Physics and Technology

Diameter–Divergence Product

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Definition: product of the diameter (at a beam waist) and the divergence angle of a laser beam

The diameter–divergence product of a laser beam is the product of the beam diameter (i.e. twice the beam radius) at the beam waist and the beam divergence angle in the far field. The higher the diameter–divergence product, the lower is the laser beam quality.

A more frequently used quantity is the beam parameter product.

See also: beam parameter product, laser beams, beam quality


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Since October 2008, the Encyclopedia of Laser Physics and Technology is also available in the form of a two-volume book. Maybe you would enjoy reading it also in that form! The print version has a carefully designed layout and can be considered a must-have for any institute library, laser research group, or laser company.

You may order the print version via Wiley-VCH.

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