Time-resolved investigation of the plasma expansion during picosecond laser material processing

G. Urbasch; F. Billmann; Juergen Jandeleit; P. Russbueldt; Hans-Georg Treusch; Ernst-Wolfgang Kreutz

doi:10.1117/12.271679

4 April 1997 Time-resolved investigation of the plasma expansion during picosecond laser material processing

G. Urbasch, F. Billmann, Juergen Jandeleit, P. Russbueldt, Hans-Georg Treusch, Ernst-Wolfgang Kreutz

Proceedings Volume 3093, Nonresonant Laser-Matter Interaction (NLMI-9); (1997) https://doi.org/10.1117/12.271679
Event: Nonresonant Laser-Matter Interaction, 1996, St. Petersburg, Russian Federation

Abstract

The expansion of the laser induced plasma during material processing of Cu, Au, Si, and Si₃N₄ with ultrashort laser pulses is investigated using streak photography and high speed photography using delayed 35 ps laser pulses. Pulses of a diode-pumped, modelocked Nd:YAG laser which are amplified by a regenerative amplifier having pulse durations of 35 ps and a maximal energy of 0.1 mJ are used. Experiments are performed using both the fundamental wavelength of 1064 nm and by frequency doubling the wavelength of 532 nm. The onset of plasma formation is during the leading edge of the pulse. The spatial expansion of the plasma corresponds to the self-similar motion of a spherical plane wave in a gas. Independent of the processed material in ambient atmosphere the energy content of the shock wave is about one fifth of the optical energy of the laser pulse.

Citation Download Citation

G. Urbasch, F. Billmann, Juergen Jandeleit, P. Russbueldt, Hans-Georg Treusch, and Ernst-Wolfgang Kreutz "Time-resolved investigation of the plasma expansion during picosecond laser material processing", Proc. SPIE 3093, Nonresonant Laser-Matter Interaction (NLMI-9), (4 April 1997); https://doi.org/10.1117/12.271679

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