Optical modulation of repaired damage site on fused silica produced by CO2 laser rapid ablation mitigation

doi:10.1088/1674-1056/ab8206

Abstract CO₂ laser rapid ablation mitigation (RAM) of fused silica has been used in high-power laser systems owing to its advantages of high efficiency, and ease of implementing batch and automated repairing. In order to study the effect of repaired morphology of RAM on laser modulation and to improve laser damage threshold of optics, an finite element method (FEM) mathematical model of 351 nm laser irradiating fused silica optics is developed based on Maxwell electromagnetic field equations, to explore the 3D near-field light intensity distribution inside optics with repaired site on its surface. The influences of the cone angle and the size of the repaired site on incident laser modulation are studied as well. The results have shown that for the repaired site with a cone angle of 73.3°, the light intensity distribution has obvious three-dimensional characteristics. The relative light intensity on z-section has a circularly distribution, and the radius of the annular intensification zone increases with the decrease of z. While the distribution of maximum relative light intensity on y-section is parabolical with the increase of y. As the cone angle of the repaired site decreases, the effect of the repaired surface on light modulation becomes stronger, leading to a weak resistance to laser damage. Moreover, the large size repaired site would also reduce the laser damage threshold. Therefore, a repaired site with a larger cone angle and smaller size is preferred in practical CO₂ laser repairing of surface damage. This work will provide theoretical guidance for the design of repaired surface topography, as well as the improvement of RAM process.

Keywords: fused silica laser repaired surface optical modulation finite element method (FEM)

Received: 09 January 2020
Revised: 22 February 2020
Accepted manuscript online:

PACS:	42.60.Jf	(Beam characteristics: profile, intensity, and power; spatial pattern formation)
	42.70.Ce	(Glasses, quartz)
	46.15.-x	(Computational methods in continuum mechanics)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51775147 and 51705105), the Science Challenge Project of China (Grant No. TZ2016006-0503-01), the Young Elite Scientists Sponsorship Program by CAST (Grant No. 2018QNRC001), the China Postdoctoral Science Foundation funded project (Grant Nos. 2018T110288 and 2017M621260), the Self-Planned Task of State Key Laboratory of Robotics and System (HIT) (Grant Nos. SKLRS201718A and SKLRS201803B).

Corresponding Authors: Ming-Jun Chen, Jian Cheng
E-mail: chenmj@hit.edu.cn;cheng.826@hit.edu.cn

Cite this article:

Chao Tan(谭超), Lin-Jie Zhao(赵林杰), Ming-Jun Chen(陈明君), Jian Cheng(程健), Zhao-Yang Yin(尹朝阳), Qi Liu(刘启), Hao Yang(杨浩), Wei Liao(廖威) Optical modulation of repaired damage site on fused silica produced by CO₂ laser rapid ablation mitigation 2020 Chin. Phys. B 29 054209

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Optical modulation of repaired damage site on fused silica produced by CO2 laser rapid ablation mitigation

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Optical modulation of repaired damage site on fused silica produced by CO₂ laser rapid ablation mitigation