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17 March 2023 Thermal accumulation and its threshold repetition rate in ultrafast laser materials processing
Xiao Jia, Xin Zhao
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Proceedings Volume 12409, Laser-based Micro- and Nanoprocessing XVII; 124090X (2023) https://doi.org/10.1117/12.2649209
Event: SPIE LASE, 2023, San Francisco, California, United States
Abstract
The thermal accumulation effect is an important phenomenon for ultrafast laser material processing and was believed to happen only at high repetition rates over MHz. This study discovers that thermal accumulation can occur at low repetition rates in the kHz range in certain materials. It is found the threshold repetition rates required to initiate thermal accumulation are intrinsically determined by the thermal properties of the material and insensitive to ambient conditions. A simple analytical method is developed to predict the thermal accumulation threshold repetition rate, and the prediction agrees well with the experimental results.
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Xiao Jia and Xin Zhao "Thermal accumulation and its threshold repetition rate in ultrafast laser materials processing", Proc. SPIE 12409, Laser-based Micro- and Nanoprocessing XVII, 124090X (17 March 2023); https://doi.org/10.1117/12.2649209
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KEYWORDS
Ultrafast lasers
Materials processing
Thermal effects
Laser damage threshold
Laser ablation
Laser processing
Numerical modeling
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