Fluorescence Enhancement Ratio Dropdown at Low Fluences during Femtosecond Double Pulse Laser Ablation

Chin. Phys. Lett.

2008, Vol. 25

Issue (7): 2653-2656 DOI:

Original Articles

Fluorescence Enhancement Ratio Dropdown at Low Fluences during Femtosecond Double Pulse Laser Ablation

Sima SINGHA², Robert J. GORDON², HU Zhan¹

¹Institute of Atomic and Molecular Physics, Jilin University, Changchun 130021²Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607-7061, USA

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Sima SINGHA, Robert J. GORDON, HU Zhan 2008 Chin. Phys. Lett. 25 2653-2656

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Abstract

In the study of double pulse ablation of materials (silicon and copper), a dropdown of double pulse to single pulse fluorescence signal enhancement at low fluences is observed. The dropdown is analysed with a simple theoretical one-dimensional heat diffusion model and verified by fluorescence time constants change as a function of fluence. The dropdown is explained as a result of liquid-solid mixture layer at the liquid and solid boundary. The effect of the layer becomes important at low fluences.

Keywords: 78.70.-g 52.5.Rv 66.10.Cb

Received: 24 December 2007 Published: 26 June 2008

PACS:	78.70.-g	(Interactions of particles and radiation with matter)
	52.5.Rv
	66.10.Cb

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2008/V25/I7/02653

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