Ultrafast pulse train micromachining

Ihtesham H. Chowdhury; Xianfan Xu; Andrew M. Weiner

doi:10.1117/12.478585

19 June 2003 Ultrafast pulse train micromachining

Ihtesham H. Chowdhury, Xianfan Xu, Andrew M. Weiner

Proceedings Volume 4978, Commercial and Biomedical Applications of Ultrafast Lasers III; (2003) https://doi.org/10.1117/12.478585
Event: High-Power Lasers and Applications, 2003, San Jose, CA, United States

Abstract

A new micromachining technique using user-defined trains of amplified femtosecond laser pulses is described. In this method, a 2-fold Michelson interferometer is used to split each output pulse of an amplified femtosecond laser system operating at 1 kHz into four different pulses at desired seperations ranging from 1 ps to 1 ns. These quadruple pulses are then focused on metal, semiconductor and dielectric samples and the material removal characteristics are noted. The experimental results show that there is a distinct effect of the pulse separation on the machining characteristics. It is observed that, in some cases, use of the quadruple pulses separated by 1 ns provides better material removal than the original pulses separated by 1 ms. The femtosecond laser-material interaction is also modeled for the case of metal samples using the two-temperature model. Numerical simulations that were carried out show that irradiation with quadruple pulses lead to a reduction in the predicted melting threshold fluence, which agrees with the experimental observation.

Citation Download Citation

Ihtesham H. Chowdhury, Xianfan Xu, and Andrew M. Weiner "Ultrafast pulse train micromachining", Proc. SPIE 4978, Commercial and Biomedical Applications of Ultrafast Lasers III, (19 June 2003); https://doi.org/10.1117/12.478585

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