Hot electrons in the interaction of femtosecond laser pulses with foil targets at a moderate laser intensity.
Characteristics of hot electrons produced in the interaction of femtosecond laser pulses with foil targets were investigated at a moderate laser intensity. Both outgoing and ingoing hot electrons from the femtosecond laser plasma were studied. A collimated jet of outgoing hot electrons was observed in the target normal direction. An ingoing energetic hot-electron beam was found in the laser propagation direction, while the low-energy ingoing electrons spread into wider cone angle due to the collisional effects in the plasma and target material. These observations were supported by three-dimensional Monte Carlo simulations. The hot-electron temperature obtained from electron spectra and absorption experiments implies that resonance absorption is partially responsible for the generation of hot electrons.
Li
Y T
YT
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, Peoples Republic of China.
Zhang
J
J
Chen
L M
LM
Mu
Y F
YF
Liang
T J
TJ
Wei
Z Y
ZY
Dong
Q L
QL
Chen
Z L
ZL
Teng
H
H
Chun-Yu
S T
ST
Jiang
W M
WM
Zheng
Z J
ZJ
Tang
X W
XW