Abstract
The γ-rays with energies up to 300 keV have been observed from plasmas produced by femtosecond laser pulses at a focused intensity of 5 × 1015W·cm-2·μm2 irradiating Ta, Mo, and Cu targets. By introducing an 8% prepulse of 70 ps before the main pulse, the fraction of high energy γ-ray photons (hν > 100 keV) was significantly enhanced relative to low energy photons (hν < 100 keV).
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