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7 June 2006 Terahertz-frequency electrical conductivity measurements of ultrashort laser-ablated plasmas
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Proceedings Volume 6261, High-Power Laser Ablation VI; 62612Q (2006)
Event: High-Power Laser Ablation 2006, 2006, Taos, NM, United States
We investigate the phase transitions of intense ultrashort laser-heated solids, from the cold solid to the hot dense plasma state, by measuring the complex electrical conductivity (or refractive index) transients at terahertz (1 THz = 1012 Hz) frequencies. Using optical-pump, terahertz-probe spectroscopy, we measured the phase shifts and absorption of terahertz probe pulses that were reflected from the warm dense plasma. To characterize the THz field, we developed and used a single-shot, high-temporal-resolution THz diagnostic capable of measuring free-space electromagnetic pulse fields in time and space. Due to relatively large focal spot sizes of the THz probe (~mm), mainly limited by the diffraction properties of THz radiation, the optical pump pulse was weakly focused onto the target in order to overfill the THz probe spot size with a peak intensity of ~1013 W/cm2. In contrast to the previous measurements of conductivities at optical frequencies, our THz non-contact probe method can directly measure quasi-DC electrical conductivities, providing insight into the transport nature of warm dense matter and any present discrepancies with the Drude model. In case of warm dense aluminum, we observe a noticeable deviation from the Drude model even in the ~1013 W/cm2 laser intensity regime. In addition, we observe strong coherent THz emission produced by a current surge in the laser-produced plasma.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
K. Y. Kim, B. Yellampelle, J. H. Glownia, A. J. Taylor, and G. Rodriguez "Terahertz-frequency electrical conductivity measurements of ultrashort laser-ablated plasmas", Proc. SPIE 6261, High-Power Laser Ablation VI, 62612Q (7 June 2006);


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