definition：
The product of the diameter of the laser beam (at the waist) and the divergence angle。
The product of the diameter divergence angle of a laser beam is the product of the beam diameter at the waist (twice the beam radius) and the beam divergence angle in the far field. The larger the product of the diameter divergence angle, the lower the beam quality of the laser。
Another more commonly used quantity is the product of beam parameters。
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