The high-energy continuum x-ray emission from plasma created by intense (1014 W cm−2) nanosecond 10-μm laser pulses has been characterized. The temperature of the superthermal electron component deduced from this emission was found to be strongly dependent on focus position, while displaying a weaker dependence on irradiation angle, beam polarization, and target composition. The variation of the hot-electron temperature as a function of Iλ2 has been examined in detail in a range of Iλ2 from 1015 to 2×1016 W μm2 cm−2 for various target materials and has been found to be in qualitative agreement with the predictions of current theories of hot-electron production based on resonance absorption.
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Enright et al. (1979) studied this question.
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