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首页> 外文期刊>Optics Letters >Thermal accumulation at kilohertz repetition rates inside fused silica under ultrafast laser irradiation
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Thermal accumulation at kilohertz repetition rates inside fused silica under ultrafast laser irradiation

机译：Ultrafast激光照射下熔融二氧化硅内的千赫兹重复率的热累积

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摘要

Thermal accumulation effect has proved to reduce ablation threshold and improve the ablation rate during multi-pulse ultrafast laser ablation. It was widely believed that this effect cannot be triggered until the laser repetition rate is raised to the megahertz range. In this Letter, we experimentally discover strong thermal accumulation in fused silica at kilohertz repetition rates and its significant contribution to enhance ablation rate. It is found that the threshold repetition rates to trigger thermal accumulation are intrinsically determined by material thermal diffusivity and insensitive to ambient conditions. We observe two-fold enhancement of the ablation rate and dearly discriminate the contribution from thermal and non-thermal accumulation effects by 35% and 50%-70%, respectively. A multi-physics model is developed to assist the understanding of the process. This Letter promotes the fundamental understanding of thermal/non-thermal accumulation effects and opens the door to low-repetition-rate thermal accumulation for low thermal diffusivity materials. (C) 2020 Optical Society of America
机译：已经证明了热累积效果以减少消融阈值，并提高多脉冲超快激光烧蚀过程中的消融率。人们普遍认为，直到激光重复率升高到Megahertz范围之前，不能触发这种效果。在这封信中，我们在实验中发现千赫氏重复率的熔融二氧化硅的强烈热累积及其显着贡献，以提高消融率。发现触发热累积的阈值重复速率由材料热扩散率本质上确定，对环境条件不敏感。我们观察到烧蚀率的两倍增强，并深受分别将热量和非热累积效应的贡献分别鉴定35％和50％-70％。开发了一种多物理模型以帮助了解该过程。这封信促进了热/非热累积效果的根本理解，并打开了用于低热扩散材料的低重复速率热累积的门。 （c）2020美国光学学会

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