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

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

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

[1]	Negress R A, Kucheyev S O, DeMange P, Bostedt C, Buuren T V, Nelson A J and Demos S G 2005 Appl. Phys. Lett. 86 171107
[2]	DeYoreo J J, Burnham A K and Whitman P K 2002 Int. Mater. Rev. 47 113
[3]	Carr A W, Radousky H B, Rubenchik A M, Feit M D and Demos S G 2004 Phys. Rev. Lett. 92 087401
[4]	Bloembergen N 1973 Appl. Opt. 12 661
[5]	Manenkov A A 2008. Proc. SPIE 7132 713202
[6]	Reyn? S, Duchateau G, Natoli J Y and Lamaign閞e L 2011 Proc. SPIE 7937 79370L
[7]	Xu Q, Wang J, Li W, Zeng X and Jing S Y 1999 Proc. SPIE 3862 236
[8]	Crisp M D, Boling N L and Dub? G 1972 Appl. Phys. Lett. 21 364
[9]	Bonneam F, Combis P, Pujols A, Rullier J L, Sesques M and Vierne J 2003 Proc. SPIE 4932 250
[10]	G閚in F Y, Salleo A, Pistor T V and Chase L L 2001 J. Opt. Soc. Am. A 18 2607
[11]	Chen M J, Li M Q, Jiang W and Xu Q 2010 J. Appl. Phys. 108 043109
[12]	DeMange P, Carr C W, Radousky H B and Demos S G 2004 Rev. Sci. Instrum. 75 3298
[13]	Carr C W, Feit M D, Johnson M A and Rubenchik A M 2006 Appl. Phys. Lett. 89 131901
[14]	Sullivan D M 2000 Electromagnetic Simulation Using the FDTD Method (New York: IEEE Press) pp. 79-89
[15]	Ge D B and Yan Y B 2002 Finite-Difference Time-Domain Method for Electromagnetic Waves (Xi'an: Xidian University Press) pp. 10-28 (in Chinese)
[16]	Gedney S D 1996 IEEE T. Antenn. Propag. 44 1630
[17]	Fujii M, Omaki N, Tahara M, Sakagami I, Poulton C, Freude W and Russer P 2005 IEEE J. Quantum Elect. 41 448
[18]	Cao Q S and Chen Y C 2003 IEEE T. Antenn. Propag. 51 350
[19]	Zhou K D, Zhang X W, Dong T L and Gu C L 2000 Electromagnetic Field Theory Fundamentals (Beijing: China Machine Press) pp. 247-248 (in Chinese)
[20]	Chen M J, Jiang W, Li M Q and Chen K N 2010 Chin. Phys. B 19 064203
[21]	Li L, Xiang X, Zu X T, Wang H J, Yuan X D, Jiang X D, Zheng W G and Dai W 2011 Chin. Phys. B 20 074209
[22]	Hrubesh L W, Brusasco R B, Grundler W, Norton M A, Donohue E E, Molander W A, Thompson S L, Strodtbeck S R, Whitman P K, Shirk M D, Wegner P J, Nostrand M C and Burnham A K 2003 Proc. SPIE 4932 180

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

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