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김태신,황승진,홍경희,유태준 한국광학회 2016 Current Optics and Photonics Vol.20 No.3
We analyzed through numerical simulations the properties of a square beam homogenizer near the targetfor laser shock peening. The efficiency was calculated near the target by considering the plasma thresholdof the metals. We defined the depth of focus of the square beam homogenizer with a given efficiencynear the target. Then, we found the relationship between the depth of focus for the laser shock peeningand four main parameters of the square beam homogenizer: the plasma threshold of the metal, the numberof lenslets in the array-lens, the focal length of the condenser lens and the input beam size.
Numerical Analysis of Working Distance of Square-shaped Beam Homogenizer for Laser Shock Peening
김태신,유태준,황승진,홍경희 한국광학회 2017 Current Optics and Photonics Vol.1 No.3
To apply a square-shaped beam homogenizer to laser shock peening, it should be designed with a longworking distance and by considering metal targets with various shapes and textures. For long workingdistances, a square-shaped beam homogenizer with a long depth of focus is required. In the range ofworking distance, the laser beam is required to have not only high efficiency but high uniformity, in otherwords, a good peening quality is guaranteed. In this study, we defined this range as the working distancefor laser shock peening. We have simulated the effect of some parameters on the working distance. Theparameters include the focal length of the condenser lens, pitch size of the array lens, and plasma thresholdof the metal. The simulation was performed through numerical analysis by considering the diffraction effect.