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1994
Conference Paper
Titel
Beamshaping by multifaceted integrator mirrors - effects of partial coherence
Abstract
In this paper the effectiveness of multifaceted beam integrators as the most common device for homogenization and shaping of laser beams is investigated for completely coherent as well as for partially coherent illumination. As theoretical analysis with the help of the point spread function (PSF) of the integrating system is performed. It allows to isolate the Fresnel number as system parameter for coherent illumination and the magnitude of phase fluctuations and their correlation length for partially coherent light as the only three parameters which determine the integrating properties completely. Experimental investigations on various laser systems are presented and the dependence of the system performance on the degree of coherence is discussed. Experimental examples of the use of coherence properties for beam shaping with integrator mirrors are given.