Abstract

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 clearly 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.

© 2020 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Study of UV repetition laser-induced absorption on fused silica surface using a surface thermal lensing technique

Kai Ke, Jian Chen, Fan Gao, Xiang Zhang, and Xiao Yuan
Opt. Lett. 45(8) 2379-2382 (2020)

Continuous multigram nanoparticle synthesis by high-power, high-repetition-rate ultrafast laser ablation in liquids

René Streubel, Stephan Barcikowski, and Bilal Gökce
Opt. Lett. 41(7) 1486-1489 (2016)

High-efficiency femtosecond ablation of silicon with GHz repetition rate laser source

Konstantin Mishchik, Guillaume Bonamis, Jie Qiao, John Lopez, Eric Audouard, Eric Mottay, Clemens Hönninger, and Inka Manek-Hönninger
Opt. Lett. 44(9) 2193-2196 (2019)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (4)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription