Mouskeftaras, Alexandros; Rode, Andrei V.; Clady, Raphaël; Sentis, Marc; Utéza, Olivier; Grojo, David
Two-photon ionization by focused femtosecond laser pulses initiates the development of
micrometer-scale plasmas in the bulk of silicon. Using pump-and-probe transmission microscopy
with infrared light, we investigate the space-time characteristics of these plasmas for laser intensities
up to 10¹²W/cm². The measurements reveal a self-limitation of the excitation at a maximum
free-carrier density of ffi1019 cm3, which is more than one order of magnitude below the threshold
for permanent...[Show more]
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