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Intense (up to a few 1017 W/cm2) femtosecond (down to 40 fs) laser pulses are focused onto a partially clusterized Argon gas jet. The target was previously characterized and optimized in order to get a homogeneous and dense jet of clusters with a well controlled size. The interaction leads to x-ray emission that is absolutely calibrated and spectrally resolved using a high resolution timeintegrated spectrometer in the K-shell range (from 2.9 to 4.3 keV). X-ray spectra are investigated as a function of di_erent laser temporal parameters such as the nanosecond pre-pulse contrast, the laser pulse duration, and the femtosecond delay between two di_erent laser pulses. The cluster size ranges from 180 to 350 °A and irradiation by laser pulses with both linear and circular polarization is investigated. The experimental results are discussed in terms of the laser-cluster interaction dynamics. They are compared with the predictions of collision-dominated nano-plasma models. However, further interaction processes are required in order to explain the observed characteristic lines demonstrating highly charged ions up to Ar16+

physical review e

Investigation of laser-irradiated Ar cluster dynamics from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>-shell x-ray emission measurements

Investigation of laser-irradiated Ar cluster dynamics fromK-shell x-ray emission measurements