The paper presents some of the traditional laser beam quality evaluation criteria, the final selection of the far-field divergence angle and the Strehl ratio, the two criteria to describe the ups and downs of the surface error frequency of the beam quality.

This paper presented a number of traditional laser beam quality criteria for the evaluation, the final selected far-field divergence angle, and the more than two to the evaluation criteria describing the ups and downs of the frequency-error of beam quality.

The paper proposed some traditional laser light beam quality evaluation criteria, finally designated the distant field divergence angle and Si Telie you compare two kind of evaluation criterias to describe the face shape error fluctuation frequency to the light beam quality influence.

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