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11 January 2000 X-ray emission from solid plasmas generated by femtosecond high-intensity laser pulses
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Proceedings Volume 3886, High-Power Lasers in Energy Engineering; (2000)
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan
We report observations of intense x-ray emission from solid targets excited by Ti:sapphire laser pulse of 1-fs duration and intensities up to 1016 W cm-2. We measured characteristic and continuum emission. X-ray emission and plasmas temperature were studied for s, p, and circular polarization states of the input laser beam. We find that circularly polarized light generates the least electron temperature compared to s and p polarizations. To complement these observations, single beam reflection from laser produced plasmas as measured. P-polarized light is reflected least, followed by circular and s-polarized light in that order. We believe that the circularly polarized light coupled into channels other than the heating of electrons even though it is absorbed more than the s-polarized case. We have also carried out x-ray emission studies with longer input pulses and find that the spectrum is mostly line emission with hardly any continuum.
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Sudeep Banerjee, Riju C. Issac, P. P. Rajeev, L. C. Tribedi, and G. Ravindra Kumar "X-ray emission from solid plasmas generated by femtosecond high-intensity laser pulses", Proc. SPIE 3886, High-Power Lasers in Energy Engineering, (11 January 2000);

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