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This document discusses measuring laser beam quality and introduces the concept of M-squared measurement. It describes how beam quality is difficult to define due to issues defining beam width. Common beam width definitions are discussed, including width at first null, variance, width at intensity points. The M-squared method uses variance to characterize beam quality, where the second moment of a beam profile obeys a universal propagation formula related to beam divergence. However, a single measure of bea

Author

Luming Zhao

Language

EN