Abstract
Femtosecond-laser-induced changes of the optical reflectivity and the reflected second harmonic are measured over a wide range of times and laser fluences. Changes of the linear and nonlinear optical properties suggestive of a transition to a metallic state have been observed. For relatively low fluences these changes take tens of picoseconds to develop. For higher fluences the transition takes place in just a few hundred femtoseconds. Our data suggest that, depending on the laser excitation conditions, two distinctly different types of phase transformations are observed.
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Sokolowski-Tinten, K., Schulz, H., Bialkowski, J. et al. Two distinct transitions in ultrafast solid-liquid phase transformations of GaAs. Appl. Phys. A 53, 227–234 (1991). https://doi.org/10.1007/BF00324257
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DOI: https://doi.org/10.1007/BF00324257