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dc.contributor.author | Qin, Yu | en |
dc.contributor.author | Nakajima, Takashi | en |
dc.contributor.author | Zen, Heishun | en |
dc.contributor.author | Wang, Xiaolong | en |
dc.contributor.author | Kii, Toshiteru | en |
dc.contributor.author | Ohgaki, Hideaki | en |
dc.contributor.alternative | 中嶋, 隆 | ja |
dc.date.accessioned | 2014-08-06T07:45:12Z | - |
dc.date.available | 2014-08-06T07:45:12Z | - |
dc.date.issued | 2014-09 | - |
dc.identifier.issn | 1350-4495 | - |
dc.identifier.uri | http://hdl.handle.net/2433/189382 | - |
dc.description.abstract | 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. | en |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Elsevier B.V. | en |
dc.rights | © 2014 Elsevier B.V. | en |
dc.rights | 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。 | ja |
dc.rights | This is not the published version. Please cite only the published version. | en |
dc.subject | Free-electron laser | en |
dc.subject | Non-Gaussian beam | en |
dc.subject | Mid-infrared | en |
dc.subject | Knife-edge method | en |
dc.subject | M2 measurement | en |
dc.title | Characterization of non-Gaussian mid-infrared free-electron laser beams by the knife-edge method | en |
dc.type | journal article | - |
dc.type.niitype | Journal Article | - |
dc.identifier.ncid | AA10992373 | - |
dc.identifier.jtitle | Infrared Physics & Technology | en |
dc.identifier.volume | 66 | - |
dc.identifier.spage | 146 | - |
dc.identifier.epage | 151 | - |
dc.relation.doi | 10.1016/j.infrared.2014.05.021 | - |
dc.textversion | author | - |
dcterms.accessRights | open access | - |
出現コレクション: | 学術雑誌掲載論文等 |
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