کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1784386 | 1524120 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterization of non-Gaussian mid-infrared free-electron laser beams by the knife-edge method
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک اتمی و مولکولی و اپتیک
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Characterization of non-Gaussian mid-infrared free-electron laser beams by the knife-edge method Characterization of non-Gaussian mid-infrared free-electron laser beams by the knife-edge method](/preview/png/1784386.png)
چکیده انگلیسی
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 â¼1.1 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Infrared Physics & Technology - Volume 66, September 2014, Pages 146-151
Journal: Infrared Physics & Technology - Volume 66, September 2014, Pages 146-151
نویسندگان
Yu Qin, Takashi Nakajima, Heishun Zen, Xiaolong Wang, Toshiteru Kii, Hideaki Ohgaki,