caa a22 4500 463213432 CHVBK 20180405153148.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s00339-007-4141-3 doi (NATIONALLICENCE)springer-10.1007/s00339-007-4141-3 Theoretical studies of ultrafast ablation of metal targets dominated by phase explosion [Elektronische Daten] [J. Yang, Y. Zhao, X. Zhu] Ultrashort pulse laser ablation of metallic targets is investigated theoretically through establishing a modified two-temperature model that takes into account both the temperature dependent electron-lattice coupling and the electron-electron-collision dominated electron diffusion processes for higher electron temperature regime. The electron-lattice energy coupling rate is found to reduce only slowly with increasing pulse duration, but grow rapidly with laser fluence, implying that the melting time of metallic materials decreases as the laser intensity increases. By taking phase explosion as the primary ablation mechanism, the predicted dependences of ablation rates on laser energy fluences for different laser pulse widths match very well with the experimental data. It is also found that during phase explosion the ablation rate is almost independent of the pulse width, whereas the ablation threshold fluence increases with the pulse duration even for femtosecond pulses. These theoretical results should be useful in having proper understanding of the ablation physics of ultrafast micromachining of metal targets. Springer-Verlag, 2007 Yang J. Institute of Modern Optics, Nankai University, 300071, Tianjin, P.R. China aut Zhao Y. Institute of Modern Optics, Nankai University, 300071, Tianjin, P.R. China aut Zhu X. Institute of Modern Optics, Nankai University, 300071, Tianjin, P.R. China aut Applied Physics A Springer-Verlag 89/2(2007-11-01), 571-578 0947-8396 89:2<571 2007 89 339 https://doi.org/10.1007/s00339-007-4141-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-4141-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yang J. Institute of Modern Optics, Nankai University, 300071, Tianjin, P.R. China aut NATIONALLICENCE 700 1- Zhao Y. Institute of Modern Optics, Nankai University, 300071, Tianjin, P.R. China aut NATIONALLICENCE 700 1- Zhu X. Institute of Modern Optics, Nankai University, 300071, Tianjin, P.R. China aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 89/2(2007-11-01), 571-578 0947-8396 89:2<571 2007 89 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer