Characterization of non-Gaussian mid-infrared free-electron laser beams by the knife-edge method
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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.
収録刊行物
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- Infrared Physics & Technology
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Infrared Physics & Technology 66 146-151, 2014-09
Elsevier B.V.
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詳細情報 詳細情報について
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- CRID
- 1050564285747817856
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- NII論文ID
- 120005462647
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- NII書誌ID
- AA10992373
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- ISSN
- 13504495
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- HANDLE
- 2433/189382
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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