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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 9 — Apr. 25, 2011
  • pp: 8870–8878

Investigation of ultrashort pulse laser ablation of solid targets by measuring the ablation-generated momentum using a torsion pendulum

Nan Zhang, Wentao Wang, Xiaonong Zhu, Jiansheng Liu, Kuanhong Xu, Peng Huang, Jiefeng Zhao, Ruxin Li, and Mingwei Wang  »View Author Affiliations


Optics Express, Vol. 19, Issue 9, pp. 8870-8878 (2011)
http://dx.doi.org/10.1364/OE.19.008870


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Abstract

50 fs - 12 ps laser pulses are employed to ablate aluminum, copper, iron, and graphite targets. The ablation-generated momentum is measured with a torsion pendulum. Corresponding time-resolved shadowgraphic measurements show that the ablation process at the optimal laser fluence achieving the maximal momentum is primarily dominated by the photomechanical mechanism. When laser pulses with specific laser fluence are used and the pulse duration is tuned from 50 fs to 12 ps, the generated momentum firstly increases and then remains almost constant, which could be attributed to the change of the ablation mechanism involved from atomization to phase explosion. The investigation of the ablation-generated momentum also reveals a nonlinear momentum-energy conversion scaling law, namely, as the pulse energy increases, the momentum obtained by the target increases nonlinearly. This may be caused by the effective reduction of the dissipated energy into the surrounding of the ablation zone as the pulse energy increases, which indicates that for femtosecond laser the dissipated energy into the surrounding target is still significant.

© 2011 OSA

OCIS Codes
(320.7100) Ultrafast optics : Ultrafast measurements
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
(350.3390) Other areas of optics : Laser materials processing

ToC Category:
Ultrafast Optics

History
Original Manuscript: March 18, 2011
Revised Manuscript: April 11, 2011
Manuscript Accepted: April 13, 2011
Published: April 21, 2011

Citation
Nan Zhang, Wentao Wang, Xiaonong Zhu, Jiansheng Liu, Kuanhong Xu, Peng Huang, Jiefeng Zhao, Ruxin Li, and Mingwei Wang, "Investigation of ultrashort pulse laser ablation of solid targets by measuring the ablation-generated momentum using a torsion pendulum," Opt. Express 19, 8870-8878 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-9-8870


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