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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 McCumber relation ： ウィキペディア英語版 McCumber relation The McCumber relation (or McCumber theory) refers to the effective cross-sections of absorption and emission of light in the physics of solid-state lasers .〔D.E.McCumber. Einstein relations connecting broadband emission and absorption spectra. PRB 136 (4A), 954–957 (1964) 〕〔P.C.Becker, N.A.Olson, J.R.Simpson. ''Erbium-doped fiber amplifiers: fundamentals and theory'' (Academic, 1999). 〕 ==Definition== Let $\backslash sigma\_(\backslash omega)$ be the effective absorption cross-section $\backslash sigma\_(\backslash omega)$ be effective emission cross-sections at frequency $\backslash omega$, and let $~T~$ be the effective temperature of the medium. The McCumber relation is :(1) $\backslash frac\backslash exp\backslash !\backslash left(\; \backslash frac\backslash right)$ =\left(\frac\right)_T =\exp\!\left( \frac T}\right) where $\backslash left(\backslash frac\backslash right)\_T$ is thermal steady-state ratio of populations; frequency $\backslash omega\_$ is called "zero-line" frequency;〔 〕〔 〕 $\backslash hbar$ is the Planck constant and $k\_$ is the Boltzmann constant. Note that the right-hand side of Equation (1) does not depend on $~\backslash omega~$. 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「McCumber relation」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.