Laser scattering of rough surfaces generated by superposition of periodic and random processes

被引：0
|
作者：
机构：
[1] Department of Engineering Physics, Tsinghua University
[2] State Key Laboratory of Laser Interaction with Matter, Northwest Institute of Nuclear Technology
来源：
Wu, Y.-J. (wuyaojun03@163.com) | 1600年 / Chinese Academy of Sciences卷 / 21期
关键词：
Height distribution; Laser scattering; Rough surface; Scattering coefficient;
D O I：
10.3788/OPE.20132103.0546
中图分类号：
学科分类号：
摘要：
The characteristics of laser scattering of rough surfaces composed of periodical and random components generated by mechanical machining were researched. Based on the Helmholtz-Kirchhoff integration theorem and some statistic theories, the formula for calculating the scattering field distribution in the space of rough surfaces was derived. According to the derived formula, the scattering coefficients of rough surfaces with different amplitudes of the periodic component and different roughnesses of the random component were obtained. Meanwhile, the spatial distribution characteristics of the scattering field and its formation were analyzed. The experiments show when the roughness of random component is far less than the laser wavelength, the number of the diffraction fringes augment with the increase of the amplitude of the periodic component. While the roughness of random component is comparable with the magnitude of the laser wavelength, the amplitude of the periodic component has a little effect on the scattering field distribution within the range of laser wavelength and the diffraction fringes are disappear. In this circumstance, the scattering field distribution in the space is considered to be modulated by changing the amplitude of the periodic component.
引用
收藏
页码：546 / 553
页数：7
相关论文
共 19 条
  • [1] Bruce N.C., Multiple scatter of vector electromagnetic waves from rough metal surfaces with infinite slopes using the Kirchhoff approximation, SPIE, 7792, (2010)
  • [2] Zhang G.Y., Yuan H.T., Miao T.Q., Total integrated scatterometer for the application in optical surface roughness measurement, Infrared and Laser Engineering, 36, pp. 265-269, (2007)
  • [3] Bruce N., Double scatter of vector electromagnetic waves from rough metal and dielectric surfaces using the Kirchhoff approximation, Journal of Physics: Conference Series, 274, (2011)
  • [4] Luo Y., Aubry A., Pendry J., Electromagnetic contribution to surface-enhanced Raman scattering from rough metal surfaces: a transformation optics approach, Physical Review B, 83, 15, pp. 155422-1, (2011)
  • [5] Pan Y.Q., Wu Z.S., Hang L.X., Influence of Ag thin films on surface roughness and light scattering of optical substrate, Acta Photonica Sinica, 38, 5, pp. 1197-1201, (2009)
  • [6] Hou H.H., Fan Z.X., Shao J.D., Et al., Scalar scattering theory of optical surfaces, Laser & Optoelectronics Progress, 42, 11, pp. 35-38, (2005)
  • [7] House R.A., Bettis J.R., Guenther A.H., Surface roughness and laser damage threshold, IEEE Journal of Quantum Electronics, pp. 361-363, (1977)
  • [8] Babu S.S.C., Surface roughness dependence of laser induced damage threshold, IEEE Journal of Quantum Electronics, 15, 7, pp. 533-535, (1979)
  • [9] Rayleigh L., On the dynamical theory of gratings, Proc. R. Soc., 79, 532, pp. 399-416, (1907)
  • [10] Rice S.O., Reflection of electromagnetic waves from slightly roughness surfaces, Communications on Pure and Applied Mathematics, 4, pp. 351-378, (1951)
12