Thermal characteristics of double-layer thin film target ablated by femtosecond laser pulses

doi:10.1088/1674-1056/20/2/024210

Abstract Thermal characteristics of tightly-contacted copper–gold double-layer thin film target under ablation of femtosecond laser pulses are investigated by using a two-temperature theoretical model. Numerical simulation shows that electron heat flux varies significantly on the boundary of copper–gold film with different maximal electron temperature of 1.15×10³ K at 5 ps after ablating laser pulse in gold and copper films, which can reach a balance around 12.6 ps and 8.2 ps for a single and double pulse ablation, respectively, and in the meantime, the lattice temperature difference crossing the gold–copper interface is only about 0.04×10³ K at the same time scale. It is also found that electron–lattice heat relaxation time increases linearly with laser fluence in both single and double pulse ablation, and a sudden change of the relaxation time appears after the laser energy density exceeds the ablation threshold.

Keywords: femtosecond laser ablation pulse train two-temperature model

Received: 01 August 2010
Revised: 01 September 2010
Accepted manuscript online:

PACS:	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)
	44.20.+b	(Boundary layer heat flow)
	65.40.De	(Thermal expansion; thermomechanical effects)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60978014), the Natural Science Foundation of Jilin Province (Grant No. 20090523) and the Educational Commission of Jilin Province (Grant No. [2008]297).

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Gao Xun(高勋), Song Xiao-Wei(宋晓伟), and Lin Jing-Quan(林景全) Thermal characteristics of double-layer thin film target ablated by femtosecond laser pulses 2011 Chin. Phys. B 20 024210

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