Abstract
High resolution soft x-ray spectra (3–40 nm) produced by the interaction of intense femtosecond laser pulses with argon clusters at an intensity of about 1×1016 W/cm2 are measured under different backing pressures. Soft x-ray spectra are strongly dependent on the initial size of cluster and plasma expanding process. We find that laser polarization has no evident effect on the soft x-ray emission from the lateral side. The measurement on angular distribution of hot electrons shows that the resonant absorption is the dominated mechanism. Both the x-ray yield and the laser energy absorption are more efficient when the radius of cluster is comparable with the plasma resonant length.
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