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oe1(光电查) - 科学论文

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?? 中文（中国） ▾

  • Tomographic reconstruction algorithms for structured gas density profiles of the targets for laser wakefield acceleration

    摘要： The output of a laser wakefield accelerator strongly depends on the gas target density profile. In this work we focus on the reconstruction of the 3D density profiles from tomographic measurements. We compare analytical and iterative methods, and we propose a new one, FARM, which is tailored for the reconstruction of gas targets for laser wakefield acceleration. Several methods are tested on both simplified and realistic geometries. The algorithms are evaluated in terms of the quality of the density profile reconstruction, the number of projections needed, and the computation time required.

    关键词： interferometry,tomography,laser wakefield acceleration,density profile,gas target,laser plasma acceleration,tomographic reconstruction,laser electron acceleration

    更新于2025-09-23 15:19:57

  • Testing of diffractive optical element as part of specific CO <sub/>2</sub> laser equipment for metallic materials modification

    摘要： Testing of a reflective diffractive optical element (DOE) as part of specific CO2 laser equipment Oerlikon OPL 2000 for metallic materials modification was performed. The power density distribution in a plane located behind the DOE focal plane has been measured. It was found that DOEs make it possible to form a predetermined beam power density profile and to perform the transformation of laser energy, chosen by calculation previously. The use of these optical elements in the laser material treatment reveals new possibilities for controlling properties and operational characteristics of processed components. Additional redistribution of the beam power to edges of the laser spot is achieved by increasing the proportion of energy reflected by DOE peripheral zones, for example, by increasing the aperture of the focusable beam. It is proposed using a telescopic system of two lenses to change the aperture of the laser beam focusable by the DOE.

    关键词： metallic materials modification,diffractive optical element,beam power density profile,CO2 laser

    更新于2025-09-19 17:13:59