翻訳と辞書 Words near each other ・ Self-actualization ・ Self-addressed stamped envelope ・ Self-adhering bandage ・ Self-adhesive stamp ・ Self-adjoint ・ Self-adjoint operator ・ Self-administered zone ・ Self-administration ・ Self-advocacy ・ Self-affinity ・ Self-affirmation ・ Self-agency ・ Self-aligned gate ・ Self-aligning nut ・ Self-amalgamating tape ・ Self-amplified spontaneous emission ・ Self-anchored suspension bridge ・ Self-anointing in animals ・ Self-archiving ・ Self-arising Primordial Awareness ・ Self-arrest ・ Self-assembled monolayer ・ Self-assembling peptide ・ Self-assembly ・ Self-assembly of nanoparticles ・ Self-assessment ・ Self-assessment (disambiguation) ・ Self-authenticating document ・ Self-authorship ・ Self-averaging Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Self-amplified spontaneous emission ： ウィキペディア英語版 Self-amplified spontaneous emission Self-amplified spontaneous emission (SASE) is a process within a free-electron laser (FEL) by which a laser beam is created from a high-energy electron beam. The SASE process starts with an electron bunch being injected into an undulator, with a velocity close to the speed of light and a uniform density distribution within the bunch. In the undulator the electrons are wiggled and emit light characteristic of the undulator strength but within a certain energy bandwidth. The emitted photons travel slightly faster than the electrons and interact with them each undulator period. Depending on the phase to each other, electrons gain or lose energy (velocity), i.e. faster electrons catch up with slower ones. Thereby the electron bunch density is periodically modulated by the radiation which is called microbunching. The structured electron beam amplifies only certain photon energies at the cost of kinetic energy until the system goes into saturation. SASE energy spectra show a noise-like distribution of intense spikes on top of a lower-amplitude background. The micro-bunch structuring reduces the phase space available to the photons, thus they are also more likely to have a similar phase and the emitted beam is quasi-coherent. This concept has been demonstrated at the SPring-8 FEL SACLA in Japan, the Free electron LASer in Hamburg (FLASH) and the Linac Coherent Light Source (LCLS) at SLAC. ==See also== *List of laser articles 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-amplified spontaneous emission」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.