散射光信号与石墨-二氧化硅激光辐照烧蚀阈值的关系

李文智; 韦成华; 高丽红; 马壮; 王富耻; 吴涛涛

doi:10.3788/CO.20160906.0642

Volume 9 Issue 6

Nov. 2016

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Article Contents

Chinese Optics > 2016 > 9(6): 642-648.

LI Wen-zhi, WEI Cheng-hua, GAO Li-hong, MA Zhuang, WANG Fu-chi, WU Tao-tao. Relationship between laser ablation threshold of graphite-SiO2 and scattering light signal[J]. Chinese Optics, 2016, 9(6): 642-648. doi: 10.3788/CO.20160906.0642

Citation:

LI Wen-zhi, WEI Cheng-hua, GAO Li-hong, MA Zhuang, WANG Fu-chi, WU Tao-tao. Relationship between laser ablation threshold of graphite-SiO₂ and scattering light signal[J]. Chinese Optics, 2016, 9(6): 642-648. doi: 10.3788/CO.20160906.0642

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Relationship between laser ablation threshold of graphite-SiO₂ and scattering light signal

doi: 10.3788/CO.20160906.0642

1.
School of Material, Beijing Institute of Technology, Beijing 100081, China
2.
State Key Laboratory of Laser Interaction with Matter, Northwest Institute of Nuclear Technology, Xi'an 710024, China

Funds:

Supported by National Natural Science Foundation of China No.51302013

More Information

Corresponding author: E-mail:gaolihong@bit.edu.cn
Received Date: 30 Jun 2016
Rev Recd Date: 09 Aug 2016
Publish Date: 01 Dec 2016

Abstract

Abstract

As inorganic additional compositions, graphite and SiO₂ have been widely used in ablation coating in the flied of aerospace. Since graphite and SiO₂ have high endothermic enthalpy of reaction under high temperature, graphite-SiO₂ composite has potential applications in the field of high power laser ablation resistance. At present, there are rare reports about laser ablation behavior of graphite-SiO₂, especially the reaction time and ablation threshold. In this paper, the near infrared(NIR) detector was used to detect the scattering light from the irradiated sample surface, and the scattering spectra were processed by differential and fitting method. Based on the scattering signal, the reaction time thresholds of graphite-SiO₂ under different power density were studied combining shape structure analysis of samples after ablation. The result shows that when the sample is irradiated by laser 500 W/cm² for 10 s, there is no mutation abserred in the scattering fitting curve, which indicates that no obvious ablation happened. But when the laser power density increases to 1 000-1 500 W/cm², the apparent turning point in the scattering fitting curve can be observed. The reaction thresholds are 1.5 s and 0.8 s, respectively. By using the laser scattering light signal from the sample surface, the time threshold value of graphite-SiO₂ composite can be effectively characterized.
- graphite-SiO₂,
- laser ablation,
- scattering light,
- ablation time threshold,
- differential fitting

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References(18)

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