Angular distribution of hot electrons generated by ultra-short ultra-intense laser interaction with solid targets

This paper reports the experimental results of the angular distribution of hot electrons during the interaction of ultrashort ultra-intense laser with solid targets. It shows that the divergence angle of hot electrons with the high energy was smaller than that of hot electrons with the low energy. There are two peaks in the angular distribution of hot electrons with the high energy: one peak in specular direction is due to several absorption or acceleration mechanism, whereas the other peak close to the normal of the target is expected by the resonance absorption and is well consistent with H. Ruhl et al's theory(1999).