Mechanism of micro-waviness induced KH2PO4 crystal laser damage and the corresponding vibration source

doi:10.1088/1674-1056/21/5/050301

Abstract The low laser induced damage threshold of the KH₂PO₄ crystal seriously restricts the output power of inertial confinement fusion. The micro-waviness on the KH₂PO₄ surface processed by single point diamond turning has a significant influence on the damage threshold. In this paper, the influence of micro-waviness on the damage threshold of the KH₂PO₄ crystal and the chief sources introducing the micro-waviness are analysed based on the combination of the Fourier modal theory and the power spectrum density method. Research results indicate that among the sub-wavinesses with different characteristic spatial frequencies there exists the most dangerous frequency which greatly reduces the damage threshold, although it may not occupy the largest proportion in the original surface. The experimental damage threshold is basically consistent with the theoretical calculation. For the processing parameters used, the leading frequency of micro-waviness which causes the damage threshold to decrease is between 350^-1 μm^-1 and 30^-1 μm^-1, especially between 90^-1 μm^-1 and 200^-1 μm^-1. Based on the classification study of the time frequencies of micro-waviness, we find that the axial vibration of the spindle is the chief source introducing the micro-waviness, nearly all the leading frequencies are related to the practical spindle frequency (about 6.68 Hz, 400 r/min) and a special middle frequency (between 1.029 Hz and 1.143 Hz).

Keywords: laser induced damage threshold micro-waviness Fourier modal theory power spectrum density

Received: 14 March 2011
Revised: 27 April 2012
Accepted manuscript online:

PACS:	03.50.Kk	(Other special classical field theories)
	42.62.Eh	(Metrological applications; optical frequency synthesizers for precision spectroscopy)
	42.70.Mp	(Nonlinear optical crystals)
	42.79.Nv	(Optical frequency converters)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50875066).

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Li Ming-Quan(李明全), Chen Ming-Jun(陈明君), An chen-Hui(安晨辉), Zhou Lian(周炼), Cheng Jian(程健), Xiao Yong(肖勇), and Jiang Wei(姜伟) Mechanism of micro-waviness induced KH₂PO₄ crystal laser damage and the corresponding vibration source 2012 Chin. Phys. B 21 050301

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Mechanism of micro-waviness induced KH2PO4 crystal laser damage and the corresponding vibration source

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Mechanism of micro-waviness induced KH₂PO₄ crystal laser damage and the corresponding vibration source