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Proceedings Paper

Time-resolved ultrafast spatial interferometric analysis of femtosecond laser-metal interactions
Author(s): David J. Funk; David S. Moore; Shawn D. McGrane; J. H. Reho; R. L. Rabie
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Paper Abstract

We have used two-dimensional ultrafast microscopic interferometry to observe the hydrodynamic motion and the time dependent changes in the optical properties of two metals (6061-T6 aluminum and ASTM 336 1018 steel) illuminated with 130 fs 800 nm laser pulses. We hve also observed the electron dynamics in optically excited aluminum, gallium, and gold at a metal-glass interface using the same technique. The interferometric technique allows construction of the two-dimensional spatial profile for laser pumped materials with a temporal resolution of < 300 fs and out-of-plane spatial resolution of 0.5 nm using 130 fs probe pulses. Best fits to the diamond turned aluminum data were obtained by assuming physically motivated functional forms for the expected hydrodynamic motion and the time-dependent complex index of refraction. Extraction of changes in the index of refraction provides evidence for melting in the gold targets. These experiments offer a new path for the observation of phase changes and/or for temperature measurements in shocked or laser excited materials, by allowing a determination of the complex index under dynamic conditions and comparing the measured values to those obtained under static conditions.

Paper Details

Date Published: 20 September 2004
PDF: 11 pages
Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); doi: 10.1117/12.548511
Show Author Affiliations
David J. Funk, Los Alamos National Lab. (United States)
David S. Moore, Los Alamos National Lab. (United States)
Shawn D. McGrane, Los Alamos National Lab. (United States)
J. H. Reho, East Carolina Univ. (United States)
R. L. Rabie, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 5448:
High-Power Laser Ablation V
Claude R. Phipps, Editor(s)

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