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26 January 2005 Propagation property of high-power laser beam through spatial filter
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We report on a theoretical analysis of propagation of monochromatic and broadband high-power laser beam through spatial filter. The law of formation of low-frequency modulation rings due to diffraction is obtained. It is found that the filling factor or the intensity modulation contrast of the laser beam is sensitive to times of diffraction limit of the filter’s pinhole. The uniformity of beam can be significantly improved by adjusting times of diffraction limit. For the same filter parameters, the broadband beam has a more uniform diffraction profile than the monochromatic beam, suggesting that the laser beam with a proper amount of bandwidth can suppress the harmful effect of diffraction to some extent.
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Kangsong Tang, Shuangchun Wen, Kaiming You, and Hua Yang "Propagation property of high-power laser beam through spatial filter", Proc. SPIE 5627, High-Power Lasers and Applications III, (26 January 2005); doi: 10.1117/12.575722;

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