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He Jing-tang1, Zhang Ping1,2, Chen Duan-bao1, Li Zu-hao1, Zhang Ying2, Wang Long2, Feng Bao-hua2, Zhang Xiu-lan2, Wei Zhi-yi2, Li Zan-liang2, Tang Xiao-wei1 and Zhang Jie2,3
Published under licence by IOP Publishing Ltd
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Citation He Jing-tang et al 1998 Chinese Phys. Lett. 15 816
DOI 10.1088/0256-307X/15/11/013
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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).