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Chin. Phys. B, 2012, Vol. 21(6): 064212    DOI: 10.1088/1674-1056/21/6/064212
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Study of modulation property to incident laser by surface micro-defects on KH2PO4 crystal

Chen Ming-Jun(陈明君), Cheng Jian(程健), Li Ming-Quan(李明全), and Xiao Yong(肖勇)
Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001, China
Abstract  KH2PO4 crystal is a crucial optical component of inertial confinement fusion. Modulation of an incident laser by surface micro-defects will induce the growth of surface damage, which largely restricts the enhancement of the laser induced damage threshold. The modulation of an incident laser by using different kinds of surface defects are simulated by employing the three-dimensional finite-difference time-domain method. The results indicate that after the modulation of surface defects, the light intensity distribution inside the crystal is badly distorted, with the light intensity enhanced symmetrically. The relations between modulation properties and defect geometries (e.g., width, morphology, and depth of defects) are quite different for different defects. The modulation action is most obvious when the width of surface defects reaches 1.064 μ. For defects with smooth morphology, such as spherical pits, the degree of modulation is the smallest and the light intensity distribution seems relatively uniform. The degree of modulation increases rapidly with the increase of the depth of surface defects and becomes stable when the depth reaches a critical value. The critical depth is 1.064 μ for cuboid pits and radial cracks, while for ellipsoidal pits the value depends on both the width and the length of the defects.
Keywords:  KH2PO4 crystal      surface defects      modulation degree      three-dimensional finite-difference time-domain  
Received:  20 October 2011      Revised:  14 December 2011      Accepted manuscript online: 
PACS:  42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation)  
  77.84.Fa (KDP- and TGS-type crystals)  
  46.15.-x (Computational methods in continuum mechanics)  
  42.62.-b (Laser applications)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50875066).
Corresponding Authors:  Chen Ming-Jun     E-mail:  chenmj@hit.edu.cn

Cite this article: 

Chen Ming-Jun(陈明君), Cheng Jian(程健), Li Ming-Quan(李明全), and Xiao Yong(肖勇) Study of modulation property to incident laser by surface micro-defects on KH2PO4 crystal 2012 Chin. Phys. B 21 064212

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