laser pulse is 150 fs and wavelength 0.4 μm, and laser is normal incident. The solid
and dotted lines are data with τ R ¼ 20 ps and 10 ps, respectively. Except for the
intensity more than 10
17 W/cm
2 , the simulation well reproduces the experimental
data. The physical values’ profiles are plotted in Fig. 3.11 at the time of intensity
0.4
0.3
0.2
absorption
0.1
0.0
10
11
10
12
10
13
10
14
intensity (W/cm 2 )
10 15 10
16
10
17
10
18
Fig. 3.10 Absorption as a
function of the laser
intensity. Pulse duration
150 fs, wavelength 400 nm.
One-dimensional fluid
simulations are done with
different electron-ion
relaxation times (solid line:
20 ps, dashed line: 10 ps).
The experimental points are
taken from Ref. 5. [Fig. 3 in
Ref. 5]
laser
10
2
10
1
10
0
10
-1
10
-2
-20
0
T
e (eV), T
i (eV),
ρ(g/cm 3
),D(10 28
erg/gs),p(Mbar)
20
40
x(nm)
60
80
100
initial target surface
D
T e
T i
p
ρD
ρ
Fig. 3.11 Spatial
dependence of the electron
temperature (T e ), the ion
temperature (T i ), the mass
density (ρ), the pressure (p),
and the laser energy
deposition (D). Laser
intensity is 10
15 W/cm
2
.
[Fig. 5 in Ref. 5]
92
3 Ultra-Short Pulse and Collisionless Absorption