A scheme to generate high field terahertz (THz) pulses by using tailored laser pulses interaction with a gas target is proposed. The laser wakefield based THz source is emitted from the asymmetric laser shape induced plasma transverse transient net currents. Particle-in-cell simulations show that THz emission with electric filed strength over 1 GV/cm can be obtained with incident laser at 1×1019W/cm2 level, and the corresponding energy conversion efficiency is more than 104. The intensity scaling holds up to high field strengths. Such a source also has a broad tunability range in amplitude, frequency spectra, and temporal shape.

1.
M. S.
Sherwin
,
C. A.
Schmuttenmaer
, and
P. H.
Bucksbaum
, Report of DOE-NSF-NIH Workshop on Opportunities in THz Science,
2004
.
2.
A.
Gopal
,
T.
May
,
S.
Herzer
,
A.
Reinhard
,
S.
Minardi
,
M.
Schubert
,
U.
Dillner
,
B.
Pradarutti
,
J.
Polz
,
T.
Gaumnitz
,
M. C.
Kaluza
,
O.
Jackel
,
S.
Riehemann
,
W.
Ziegler
,
H. P.
Gemuend
,
H. G.
Meyer
, and
G. G.
Paulus
,
New J. Phys.
14
,
083012
(
2012
).
3.
M.
Rini
,
R.
Tobey
,
N.
Dean
,
J.
Itatani
,
Y.
Tomioka
,
Y.
Tokura
,
R. W.
Schoenlein
, and
A.
Cavalleri
,
Nature
449
,
72
(
2007
).
4.
M. K.
Liu
,
H. Y.
Hwang
,
H.
Tao
,
A. C.
Strikwerda
,
K.
Fan
,
G. R.
Keiser
,
A. J.
Sternbach
,
K. G.
West
,
S.
Kittiwatanakul
,
J. W.
Lu
,
S. A.
Wolf
,
F. G.
Omenetto
,
X.
Zhang
,
K. A.
Nelson
, and
R. D.
Averitt
,
Nature
487
,
345
(
2012
).
5.
K. Y.
Kim
,
Phys. Plasmas
16
,
056706
(
2009
).
6.
K. Y.
Kim
,
A. J.
Taylor
,
J. H.
Glownia
, and
G.
Rodriguez
,
Nat. Photonics
2
,
605
(
2008
).
7.
X.
Xie
,
J. M.
Dai
, and
X.-C.
Zhang
,
Phys. Rev. Lett.
96
,
075005
(
2006
).
8.
D.
Dietze
,
K.
Unterrainer
, and
J.
Darmo
,
Appl. Phys. Lett.
100
,
091113
(
2012
).
9.
Y.
Bai
,
L. W.
Song
,
R. J.
Xu
,
C.
Li
,
P.
Liu
,
Z. N.
Zeng
,
Z. X.
Zhang
,
H. H.
Lu
,
R. X.
Li
, and
Z. Z.
Xu
,
Phys. Rev. Lett.
108
,
255004
(
2012
).
10.
H. C.
Wu
,
J.
Meyer-ter-Vehn
, and
Z. M.
Sheng
,
New J. Phys.
10
,
043001
(
2008
).
11.
A. A.
Silaev
and
N. V.
Vvedenskii
,
Phys. Rev. Lett.
102
,
115005
(
2009
).
12.
A.
Houard
,
Y.
Liu
,
B.
Prade
,
V. T.
Tikhonchuk
, and
A.
Mysyrowicz
,
Phys. Rev. Lett.
100
,
255006
(
2008
).
13.
W. M.
Wang
,
Z. M.
Sheng
,
H. C.
Wu
,
M.
Chen
,
C.
Li
,
J.
Zhang
, and
K.
Mima
,
Opt. Express
16
,
16999
(
2008
).
14.
Z. M.
Sheng
,
K.
Mima
,
J.
Zhang
, and
H.
Sanuki
,
Phys. Rev. Lett.
94
,
095003
(
2005
).
15.
H. C.
Wu
,
Z. M.
Sheng
, and
J.
Zhang
,
Phys. Rev. E
77
,
046405
(
2008
).
16.
C.
Nieter
and
J. R.
Cary
,
J. Comput. Phys.
196
,
448
(
2004
).
17.
A. K.
Upadhyay
,
S. A.
Samant
, and
S.
Krishnagopal
,
Phys. Plasmas
20
,
013106
(
2013
).
18.
X. G.
Dong
,
Z. M.
Sheng
,
H. C.
Wu
,
W. M.
Wang
, and
J.
Zhang
,
Phys. Rev. E
79
,
046411
(
2009
).
19.
H. W.
Du
,
M.
Chen
,
Z. M.
Sheng
,
J.
Zhang
,
H. C.
Wu
, and
W. M.
Wang
,
Appl. Phys. Lett.
101
,
181113
(
2012
).
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