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Intraband and interband absorption of femtosecond laser pulses in copper

Published online by Cambridge University Press:  30 August 2005

D. FISHER ,
M. FRAENKEL ,
Z. ZINAMON ,
Z. HENIS ,
E. MOSHE ,
Y. HOROVITZ ,
E. LUZON ,
S. MAMAN  and
S. ELIEZER
D. FISHER
Affiliation:
Department of Plasma Physics, Soreq NRC, Yavne, Israel Faculty of Physics, Weizmann Institute of Science, Rehovot, Israel
M. FRAENKEL
Affiliation:
Department of Plasma Physics, Soreq NRC, Yavne, Israel
Z. ZINAMON
Affiliation:
Faculty of Physics, Weizmann Institute of Science, Rehovot, Israel
Z. HENIS
Affiliation:
Department of Plasma Physics, Soreq NRC, Yavne, Israel
E. MOSHE
Affiliation:
Department of Plasma Physics, Soreq NRC, Yavne, Israel
Y. HOROVITZ
Affiliation:
Department of Plasma Physics, Soreq NRC, Yavne, Israel
E. LUZON
Affiliation:
Department of Plasma Physics, Soreq NRC, Yavne, Israel Racah Institute of Physics, The Hebrew University, Jerusalem, Israel
S. MAMAN
Affiliation:
Department of Plasma Physics, Soreq NRC, Yavne, Israel
S. ELIEZER
Affiliation:
Department of Plasma Physics, Soreq NRC, Yavne, Israel
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Abstract

We investigated the optical properties of pure copper irradiated by a femtosecond laser pulse. Self-absorption of 50-fs laser pulses at 800 nm and 400 nm wavelengths (below and above the interband absorption threshold, respectively) is studied for peak laser intensities up to 1015 W/cm2. Theoretical description of laser interaction with copper target is developed, solving numerically the energy balance equations for electron and ion subsystems together with Maxwell equations for laser radiation field inside the target. The theory accounts for both intraband and interband absorption mechanisms. We treated in detail the changes in electron structure and distribution function with an increase in electron temperature, as well as the ensuing changes in thermodynamic properties, collision frequencies, optical and transport coefficients. Experimental work on self-absorption of femtosecond laser pulses in copper targets at 800 nm and 400 nm wavelengths is ongoing. Results for 800 nm wavelength are reported. Theory and experiment are in good agreement.

Keywords

CopperCore state ionizationFemtosecondInterbandMetal plasma transition
Type
Research Article
Information
Laser and Particle Beams , Volume 23 , Issue 3 , September 2005 , pp. 391 - 393
Copyright
© 2005 Cambridge University Press

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Footnotes

This paper was presented at the 28th ECLIM conference in Rome, Italy.

References

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