“beam divergence”的概念、定义、翻译、参考文献-科学参考

单词	beam divergence
释义	beam divergence [`bēm dǝ´vǝr·jǝns] ^OPTICS The angle between points on opposite sides of a light beam at which the irradiance drops to 1/e (0.37) times its maximum value. ^PHYSICS The angular spread in the directions of the components of a beam of particles or radiation.
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