16 February 2018 Micromachining using pulse bursts: influence of the pulse duration and the number of pulses in the burst on the specific removal rate
Author Affiliations +
The today available ultra-short pulsed laser systems offer average power in the range of 100 W or even more resulting in high pulse energies. In contrast to treat metals only moderate peak fluences are required to work at the well-known optimum point, where the ablation process is most energy efficient. In a standard setup the laser beam is deflected by a galvo scanner. The achievable scan speed is limited and therefore also the usable repetition frequency and average power. The use of pulse bursts instead of single pulses is a possibility to further increase the ablation rate, i.e. using higher average power. This further increase is crucial for the usage of the ultra-short pulses in industrial applications. It was shown in previous publications that the number of pulses in the burst have a significant influence on the specific removal rate in case of ps pulses. It was observed, that the second pulse of a 2-pulse burst is shielded by the particle plume of the first pulse of the burst. It is believed that the shielding effect depends on the particle density of the plume, thus the effect should be stronger if more material is ablated. As already known, a decrease of the pulse duration to a few hundreds of fs leads to an increase of the specific removal rate for single pulses. In this work we investigate the influence of pulse bursts on the specific removal rate as well as the pulse duration on the ablation process using pulse bursts.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
B. Jaeggi, L. Cangueiro, D. Bruneel, J. A. Ramos de Campos, C. Hairaye , B. Neuenschwander, "Micromachining using pulse bursts: influence of the pulse duration and the number of pulses in the burst on the specific removal rate", Proc. SPIE 10519, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII, 1051905 (16 February 2018); doi: 10.1117/12.2289549; https://doi.org/10.1117/12.2289549


Non-infrared femtosecond lasers: status and prospects
Proceedings of SPIE (March 09 2016)
Throughput optimization for laser micro structuring
Proceedings of SPIE (March 04 2016)
Processing of metals with ps laser pulses in the range...
Proceedings of SPIE (February 21 2011)
Fast micromachining using picosecond lasers
Proceedings of SPIE (March 08 2005)

Back to Top