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8 September 1999 Effects of chopper on laser texturing of rolls by CO2 laser
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Proceedings Volume 3862, 1999 International Conference on Industrial Lasers; (1999)
Event: International Symposium on Industrial Lasers, 1999, Wuhan, China
The effects of chopper on laser-texturing of rolls by CO2 laser are reported in the paper. The propagation of laser radiation through chopper can be described as four states: (1) chopping state; (2) transition state from chopping to transmitting; (3) transmitting state; and (4) transition state from transmitting to chopping. The distribution of laser energy flux on roll surface is derived from these descriptions and the assumption of Gauss beam, and the thermal physical process of laser-texturing is numerically simulated. It is true that the reflected laser radiation from state (1) and the direct laser radiation from state (3) can be superimposed to result in efficient texturing, but these effects are not so obvious as stated in published literatures. Shorter focal length will benefit in more efficient laser texturing because laser power density increase quickly with the decrease of focal length. In the case of short focal length, the superimposition effect is almost invisible, and the position of chopper because important, it should be near to the roll surface for a clear pattern of separated texturing points.
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Duluo Zuo, Daqing Zhu, Zhene Xu, and Shimin Li "Effects of chopper on laser texturing of rolls by CO2 laser", Proc. SPIE 3862, 1999 International Conference on Industrial Lasers, (8 September 1999);

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