Terahertz Inspection of Laser-Induced Damage of Fused Silica

被引：1
|
作者：
Shi W. [1 ]
Shang X. [1 ,2 ]
Su J. [2 ]
Dong C. [1 ]
机构：
[1] Faculty of Science, Xi'an University of Technology, Xi'an, 710054, Shaanxi
[2] School of Optoelectronic Engineering, Xi'an Technological University, Xi'an, 710021, Shaanxi
来源：
Zhongguo Jiguang/Chinese Journal of Lasers | 2019年 / 46卷 / 06期
关键词：
Fused silica; Identification and inspection; Laser induced damage; Terahertz time-domain spectroscopy;
D O I：
10.3788/CJL201946.0614018
中图分类号：
学科分类号：
摘要：
In this study, the undamaged and damaged areas in fused silica induced by laser with different energies were tested with the transmission terahertz time-domain spectral system. The time domain signal and frequency spectra of 0.8-1.25 THz are obtained. The peak-to-peak value, amplitude, transmission spectrum, refractive index, and absorbance are analyzed. The results show that the peak-to-peak value, amplitude, transmission spectrum, and refractive index of the damaged area are obviously reduced compared with those of the undamaged area, and with the increase of laser energy and the enlargement of damaged area, these parameters gradually decrease. In contrast, the absorbance exhibits an opposite change. Therefore, the variation in the optical properties of fused silica in the terahertz wave band could be applied to distinguish the damages and analyze the degree of damage, which provides a good basis for applying the terahertz time domain spectral technique to the identification and analysis of laser-induced damage. © 2019, Chinese Lasers Press. All right reserved.
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