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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 Self-pulsation ： ウィキペディア英語版 Self-pulsation Self-pulsation is a transient phenomenon in continuous-wave lasers. Self-pulsation takes place at the beginning of laser action. As the pump is switched on, the gain in the active medium rises and exceeds the steady-state value. The number of photons in the cavity increases, depleting the gain below the steady-state value, and so on. The laser pulsates; the output power at the peaks can be orders of magnitude larger than that between pulses. After several strong peaks, the amplitude of pulsation reduces, and the system behaves as a linear oscillator with damping. Then the pulsation decays; this is the beginning of the continuous-wave operation. ==Equations== The simple model of self-pulsation deals with number $X$ of photons in the laser cavity and number $~Y~$ of excitations in the gain medium. The evolution can be described with equations: : $~\backslash begin$ ~. $~\backslash theta~$ is the transmission coefficient of the output coupler. $~\backslash tau~$ is the lifetime of excitation of the gain medium. $P\_$ is power of pump absorbed in the gain medium (which is assumed to be constant). Such equations appear in the similar form (with various notations for variables) in textbooks on laser physics, for example, the monography by A.Siegman.〔 }〕 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「Self-pulsation」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.