Time-resolved electron shadowgraphy measurement was performed in infrared 300 ps laser ablation of a copper film in order to investigate expanding plasma into vacuum with space-charge separation. The probe-electron pulse was generated by intense femtosecond laser irradiation on a tungsten bulk target. Time-resolved electron shadowgraphs showed evolving “bright” and “shadow” plumes with expanding speeds of 970 and 110 km/s, when the laser intensity was 980 G W/cm2. These are attributed to be space-charge separation field and ion plume, respectively.

1.
J. D.
Kmetec
,
C. L.
Gordon
III,
J. J.
Macklin
,
B. E.
Lemoff
,
G. S.
Brown
, and
S. E.
Harris
,
Phys. Rev. Lett.
68
,
1527
(
1992
).
Google Scholar
Crossref
Search ADS
PubMed
 
2.
G.
Malka
and
J. L.
Miquel
,
Phys. Rev. Lett.
77
,
75
(
1996
).
Google Scholar
Crossref
Search ADS
PubMed
 
3.
M.
Yoshida
,
Y.
Fujimoto
,
Y.
Hironaka
,
K. G.
Nakamura
,
K.
Kondo
,
M.
Ohtani
, and
H.
Tsunemi
,
Appl. Phys. Lett.
73
,
2393
(
1998
).
Google Scholar
Crossref
Search ADS
 
4.
K.
Nemoto
,
A.
Maksimchuk
,
S.
Banerjee
,
K.
Flippo
,
G.
Mourou
,
D.
Umstadter
, and
V. Yu.
Bychenkov
,
Appl. Phys. Lett.
78
,
595
(
2001
).
Google Scholar
Crossref
Search ADS
 
5.
Y.
Oishi
,
T.
Nayuki
,
K.
Nemoto
,
Y.
Okano
,
Y.
Hironaka
,
K. G.
Nakamura
, and
K.
Kondo
,
Appl. Phys. Lett.
79
,
1234
(
2001
).
Google Scholar
Crossref
Search ADS
 
6.
T.
Guo
,
Ch.
Spielmann
,
B. C.
Walker
, and
C. P. J.
Barty
,
Rev. Sci. Instrum.
72
,
41
(
2001
).
Google Scholar
Crossref
Search ADS
 
7.
N. M.
Bulgakova
,
A. V.
Bulgakov
, and
O. F.
Bobrenok
,
Phys. Rev. E
62
,
5624
(
2000
).
Google Scholar
Crossref
Search ADS
 
8.
S. P.
Hatchett
,
C. G.
Brown
,
T. E.
Cowan
,
E. A.
Henry
,
J. S.
Johnson
,
M. H.
Key
,
J. A.
Koch
,
A. B.
Langdon
,
B. F.
Lasinski
,
R. W.
Lee
,
A. J.
Mackinnon
,
D. M.
Pennington
,
M. D.
Perry
,
T. W.
Phillips
,
M.
Roth
,
T. C.
Sangster
,
M. S.
Singh
,
R. A.
Snavely
,
M. A.
Stoyer
,
S. C.
Wilks
, and
K.
Yasuike
,
Phys. Plasmas
7
,
2076
(
2000
).
Google Scholar
Crossref
Search ADS
 
9.
A. A.
Plyutto
,
Sov. Phys. JETP
12
,
1106
(
1961
).
Google Scholar
 
10.
G.
Hairapetian
and
R. L.
Stenzel
,
Phys. Fluids B
3
,
899
(
1991
).
Google Scholar
Crossref
Search ADS
 
11.
A.
Taniyama
,
D.
Shindo
, and
T.
Oikawa
,
J. Electron Microsc.
46
,
303
(
1997
).
Google Scholar
Crossref
Search ADS
 
12.
Transmittance of electrons through a light-shielding paper was estimated by using a Monte Carlo simulation program of CASINO v2.24 (D. Drouin, A. R. Couture, R. Gauvin, P. Hovington, P. Horny, and H. Demers, University of Sherbrooke, Quebec, Canada). Composition of the paper was assumed as C6H10O5 (cellulose) with measured density of 1.04 g/cm3.
13.
Y.
Hironaka
,
T.
Inoue
,
Y.
Fujimoto
,
K. G.
Nakamura
, and
K.
Kondo
,
Jpn. J. Appl. Phys., Part 2
38
,
L242
(
1999
).
Google Scholar
Crossref
Search ADS
 
14.
Y.
Okano
,
H.
Kishimura
,
Y.
Hironaka
,
K. G.
Nakamura
, and
K.
Kondo
,
Appl. Surf. Sci.
197–198
,
237
(
2002
).
Google Scholar
 
This content is only available via PDF.
© 2003 American Institute of Physics.
2003
American Institute of Physics
You do not currently have access to this content.