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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 Z-scan technique ： ウィキペディア英語版 Z-scan technique In Nonlinear optics a z-scan measurement is used to measure the non-linear index $n\_$ Kerr nonlinearity and the non-linear absorption coefficient Δα via the "closed" and "open" methods respectively. As nonlinear absorption can affect the measurement of the non-linear index the open method is typically used in conjunction with the closed method to correct the calculated value. ==Closed Aperture Z-scan Technique== In this setup an aperture is placed to prevent some of the light from reaching the detector. The equipment is arranged as can be seen in the diagram. A lens focuses a laser to a certain point, and after this point the beam naturally defocuses. After a further distance an aperture is placed with a detector behind it. The aperture causes only the central region of the cone of light to reach the detector. Typically values of the normalised transmittance are between The detector is now sensitive to any focusing or defocusing that a sample may induce. The sample is typically placed at the focus point of the lens, and then moved along the z axis a distance of $\backslash pm\; z\_$ which is given by the Rayleigh length $z\_$: $z\_=\backslash frac\}$ The thin sample approximation states that the thickness of the sample $L$ must be less than the Rayleigh length 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「Z-scan technique」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.