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ファイル | 記述 | サイズ | フォーマット | |
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j.infrared.2014.05.021.pdf | 1.38 MB | Adobe PDF | 見る/開く |
タイトル: | Characterization of non-Gaussian mid-infrared free-electron laser beams by the knife-edge method |
著者: | Qin, Yu Nakajima, Takashi Zen, Heishun https://orcid.org/0000-0002-2719-6985 (unconfirmed) Wang, Xiaolong Kii, Toshiteru Ohgaki, Hideaki https://orcid.org/0000-0002-3553-4091 (unconfirmed) |
著者名の別形: | 中嶋, 隆 |
キーワード: | Free-electron laser Non-Gaussian beam Mid-infrared Knife-edge method M2 measurement |
発行日: | Sep-2014 |
出版者: | Elsevier B.V. |
誌名: | Infrared Physics & Technology |
巻: | 66 |
開始ページ: | 146 |
終了ページ: | 151 |
抄録: | We report the characterization of mid-infrared free-electron laser (FEL) beams at the wavelength of 11 μm by the knife-edge method. From the knife-edge data we find that the FEL beam has a non-Gaussian shape. To represent the non-Gaussian beam shape we employ two methods: fitting the knife-edge data to some analytical functions with a few free parameters and numerical smoothing of the knife-edge data. Both methods work equally well. Using those data we can reconstruct the two-dimensional (2D) beam profiles at different positions around the focus by assuming that the 2D intensity distribution function is separable in x (horizontal) and y (vertical) directions. Using the 2D beam profiles at different positions around the focus, we find that the beam propagation factor (M2 factor) is ∼1.1 in both x and y directions. As a cross-check, we also carry out the burn pattern experiment to find that the behavior of the focused FEL beam along the propagation is consistent with the results obtained by the knife-edge method. |
著作権等: | © 2014 Elsevier B.V. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/189382 |
DOI(出版社版): | 10.1016/j.infrared.2014.05.021 |
出現コレクション: | 学術雑誌掲載論文等 |
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