Time-resolved ultrafast spatial interferometric analysis of femtosecond laser-metal interactions

David J. Funk; David S. Moore; Shawn D. McGrane; J. H. Reho; R. L. Rabie

doi:10.1117/12.548511

20 September 2004 Time-resolved ultrafast spatial interferometric analysis of femtosecond laser-metal interactions

David J. Funk, David S. Moore, Shawn D. McGrane, J. H. Reho, R. L. Rabie

Proceedings Volume 5448, High-Power Laser Ablation V; (2004) https://doi.org/10.1117/12.548511
Event: High-Power Laser Ablation, 2004, Taos, New Mexico, United States

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.

Citation Download Citation

David J. Funk, David S. Moore, Shawn D. McGrane, J. H. Reho, and R. L. Rabie "Time-resolved ultrafast spatial interferometric analysis of femtosecond laser-metal interactions", Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); https://doi.org/10.1117/12.548511

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