Technique for diagnosing x-ray laser beam quality by use of the moire signal
Data(s) |
1999
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Resumo |
We present what we believe is a novel technique based on the moire effect for fully diagnosing the beam quality of an x-ray laser. Using Fresnel diffraction theory, we investigated the intensity profile of the moire pattern when a general paraxial beam illuminates a pair of Ronchi gratings in the quasi-far field. Two formulas were derived to determine the beam quality factor M-2 and the effective radius of curvature R-e from the moire pattern. On the basis of the results, the far-field divergence, the waist location, and the radius can be calculated further. Finally, we verified the approach by use of numerical simulation. (C) 1999 Optical Society of America [S0740-3232(99)01502-1]. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Yang J;范滇元;Wang SJ;Gu YA.,J. Opt. Soc. Am. A-Opt. Image Sci. Vis.,1999,16(2):323-330 |
Palavras-Chave | #PROPAGATION #COHERENCE #TARGET |
Tipo |
期刊论文 |