[1] [1] O. Deutscher. Methods for attaining particular roughness: on cold rolled strip [J]. Iron and Steel Engineer, 1997, 74(5): 35～40

[2] [2] J. Crahay. Modulating a laser beam [P]. US Patent,4462660, 1984

[3] [3] T. Frederic. Device for modulate a laser beam [P]. US Patent,4885751, 1989

[4] [4] Zuo Duluo, Zhu Daqing, Xu Zhene et al.. Effects of chopper on laser-texturing of rolls by CO2 laser [C]. SPIE, 1999, 3862: 347～351

[5] [5] Liu Liping, Wang Qi. Design of the local beam branch in CO2 laser imaging radar optical system [J]. Chinese J. Lasers, 2003, 30(7): 605～608

[6] [6] Lü Baida. Laser Optics: Laser Beam Propagation and Beam Quality Control [M]. Chengdu: Sichuan University Press, 1992