Influence of pulse length on heat affected zones of evaporatively-mitigated damages of fused silica optics by CO2 laser

Zhang, Chuanchao; Zhang, Lijuan; Jiang, Xiaolong; Jia, Baoshen; Liao, Wei; Dai, Rucheng; Chen, Jing; Yuan, Xiaodong; Jiang, Xiaodong

doi:10.1016/j.optlaseng.2019.105857

Cited by 27 publications

(3 citation statements)

References 25 publications

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“…1(a), the fiber model is a cylinder with a diameter of 250μm and a length of 1000μm, the energy distribution of the beam spot is Gaussian. The corresponding nonlinear heat conduction equation is expressed as [14]:…”

Section: Model Descriptionmentioning

confidence: 99%

Numerical simulation of surface topography evolution during pulsed CO2 laser ablation of fiber

Wu²,

Ma³

2022

Sixth International Symposium on Laser Interaction With Matter

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D-shaped fiber manufacturing by mechanical grinding or chemical acid will inevitably introduce subsurface damages or impurity during processing. Laser ablation has been proven to be a high-efficiency non-contact technique that can achieve a low-defect surface. However, the process of laser processing fiber involves the phase change of the material, which leads to a very complicated evolution process of the surface topography of the fiber. In order to predict the surface topography of fiber during irradiation by pulse laser. Herein, a 3D model has been established to assist the understanding of the thermal mechanism of pulsed CO2 laser ablation and phase change of evaporation during ablation. Furthermore, the temperature characteristics of the fiber surface during the laser irradiation are also analyzed. The simulation results show that from the second pulse, the ablation depth is basically stable, and the texture formed on the fiber surface is related to the processing parameters.

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Section: Model Descriptionmentioning

confidence: 99%

Numerical simulation of surface topography evolution during pulsed CO2 laser ablation of fiber

Wu²,

Ma³

2022

Sixth International Symposium on Laser Interaction With Matter

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“…CO 2 laser processing of glass has been used for decades, but it is still a very active field of research to develop innovative processes. Recent interests include for instance optics manufacturing [1][2][3][4] , surface micromachining [5][6][7][8] , to produce refractive or diffractive optical elements, processing of optical fibers [9][10][11][12][13] , including end-facet, fiber or cladding processing, or mitigation of surface damage in high power laser components [14][15][16][17][18] , such as laser damage or scratches. The CO 2 laser-material interaction is particularly suitable for thermal treatments and processing of fused silica because this glass has a high thermal shock resistance due to a low thermal expansion coefficient 19 .…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of CO2 laser ablation of fused silica with sub-microsecond pulses

Quintal

Cormont

Gallais

2021

Journal of Applied Physics

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The CO2 laser material interaction is commonly used for thermal treatments and processing of fused silica glasses. As the laser pulse duration decreases down to a few tens of microseconds, the heat-affected depth in the material decreases up to the point where it has the same magnitude as the laser radiation penetration depth, which is an interesting operating point for applications that require minimal heat-affected zone. In this work, we explore the effects of CO2 laser pulses in the range of 100 μs to a few milliseconds on the laser ablation of polished fused silica surfaces, based on experiments and numerical simulations. We particularly study the evolution of surface profile as a function of the number of applied pulses. The results suggest that the ablation depth can be accurately controlled from a few hundreds of nanometers to a few tens of micrometers by adjusting the combination of the number of applied pulses and pulse duration.

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“…[14] This method uses an ultrafast laser beam to scan and remove the damage material on the surface of fused silica optics, forming a smooth conical crater to achieve the purpose of laser damage mitigation. RAM has the advantages of excellent repair quality, high efficiency, and easy to implement batch and automated repairing, [15][16][17] which has been already applied in USA National Ignition Facility, [3] France Laser Mega-Joule, [18] China huge laser facility. [19] However, in the process of practical localized CO 2 laser repairing of surface damage, it is found that the repaired surface morphology has a certain modulation effect to the incident laser.…”

Section: Introductionmentioning

confidence: 99%

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

Tan¹,

Zhao²,

Chen³

et al. 2020

Chinese Phys. B

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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.

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Influence of pulse length on heat affected zones of evaporatively-mitigated damages of fused silica optics by CO2 laser

Cited by 27 publications

References 25 publications

Numerical simulation of surface topography evolution during pulsed CO2 laser ablation of fiber

Numerical simulation of surface topography evolution during pulsed CO2 laser ablation of fiber

Experimental and numerical investigation of CO2 laser ablation of fused silica with sub-microsecond pulses

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

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Influence of pulse length on heat affected zones of evaporatively-mitigated damages of fused silica optics by CO2 laser

Cited by 27 publications

References 25 publications

Numerical simulation of surface topography evolution during pulsed CO2 laser ablation of fiber

Numerical simulation of surface topography evolution during pulsed CO2 laser ablation of fiber

Experimental and numerical investigation of CO2 laser ablation of fused silica with sub-microsecond pulses

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

Contact Info

Product

Resources

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