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

doi:10.1088/1674-1056/21/6/064212

中国物理B ›› 2012, Vol. 21 ›› Issue (6): 64212-064212.doi: 10.1088/1674-1056/21/6/064212

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

陈明君, 程健, 李明全, 肖勇

Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001, China

收稿日期:2011-10-20 修回日期:2011-12-14 出版日期:2012-05-01 发布日期:2012-05-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 50875066).

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

Received:2011-10-20 Revised:2011-12-14 Online:2012-05-01 Published:2012-05-01
Contact: Chen Ming-Jun E-mail:chenmj@hit.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 50875066).

摘要/Abstract

摘要： 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.

关键词: KH₂PO₄ crystal, surface defects, modulation degree, three-dimensional finite-difference time-domain

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.

Key words: KH₂PO₄ crystal, surface defects, modulation degree, three-dimensional finite-difference time-domain

中图分类号: (Beam characteristics: profile, intensity, and power; spatial pattern formation)

42.60.Jf

77.84.Fa (KDP- and TGS-type crystals) 46.15.-x (Computational methods in continuum mechanics) 42.62.-b (Laser applications)

陈明君, 程健, 李明全, 肖勇. Study of modulation property to incident laser by surface micro-defects on KH₂PO₄ crystal[J]. 中国物理B, 2012, 21(6): 64212-064212.

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[J]. Chin. Phys. B, 2012, 21(6): 64212-064212.

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

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

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