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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク M squared ： ウィキペディア英語版 M squared In laser science, the parameter M², also known as the beam quality factor, is a quantity that represents the degree of variation of a beam from an ideal Gaussian beam at the same wavelength. It is calculated from the ratio of the beam parameter product (BPP) of the beam to the BPP of a Gaussian beam. ==Comparison to Gaussian beams== M² is a better guide to beam quality than Gaussian appearance, however, since there are many cases in which the beam can ''look'' Gaussian, yet have an M² value far from unity.〔 Tutorial presentation at the Optical Society of America Annual Meeting, Long Beach, California〕 Likewise, a beam intensity profile can appear very "un-Gaussian", yet have an M² value close to unity. For a single mode TEM00 Gaussian laser beam, M² is exactly one. The value of M² can be determined by measuring D4σ or "second moment" width. Unlike the beam parameter product, M² is unitless and does not vary with wavelength. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「M squared」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.