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- W2586376013 abstract "In first approximation the material induced effects after laser beam interaction are function of the whole transmitted energy and of the local irradiance (in W.cm -2 ) levels and gradients. Consequently 3 informations may be able to describe this beam : carried power, shape and dimensions in the interaction zone. Thus shape and dimensions of a real beam would be simply and universaly described. If we are interested by the induced effects in the straight of the beam axis, 3 parameters are sufficient to describe the beam : the incident power P, an equivalent radius r + , and an axial spread factor of energy distribution g(E). These parameters have been mathematically defined but they are also experimentally measurable (in particular from transmitted power through a small aperture or a slit localised in the vicinity of the work zone). The experimental characterization of a 4 kW c.w. CO 2 laser (CILAS CI 4000) has been carried out for several powers (between 200 W and 3 kW). When the power increases it has been find that r+ increases and g(E) stays nearly constant in spite of evolution. Presently the real-time evaluation of these parameters is investigating. Moreover these 3 parameters can be directly introduced in simplified analytical tridimensional thermal model, and so the behaviour expectation and the working parameters fluctuations effects (for example mode changes) become easier. At last this approach may be able to carry out objective comparison between the various high power lasers in different laboratories." @default.
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- W2586376013 date "1988-01-16" @default.
- W2586376013 modified "2023-09-23" @default.
- W2586376013 title "Characterization Of Real Laser Beam Profiles With Few Parameters For Metallurgical Applications" @default.
- W2586376013 doi "https://doi.org/10.1117/12.968905" @default.
- W2586376013 hasPublicationYear "1988" @default.
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