レーザー生成フィラメントを用いた DARC からのサブ

35
Sub Terahertz emission from DARC structure by laser-created filament
(
)
Noboru YUGAMI, Takamitsu OTSUKA, Takeharu HOMMYO, Yusuke HYUGA (Utsunomiya Univ.)
1.
10
0
Gas pressure (Pa)
10
1
2
10
0
DC
to AC Radiation converter (DARC)
DARC
1)
ω≈
1995
UCLA Mori
1996
UCLA
Lai
2)
DARC
ω2
k0 vf
+ p
2
2k0 vf
Signal intensity (arb. units)
10
(1)
−1
10
−2
10
13
14
10
15
10
10
16
10
−3
Electron density (cm )
k0
ωp
vf ≈ c
F−band: 4.5 kV
G−band: 4.3 kV
Y−band: 4.3 kV
1
3.
(1)
1
F,G
Y
1
N
ω
Δω =
N
(2)
2
(1)
(2)
DARC
2.
DARC
DARC
2 mm
kV
120 fs (FWHM)
10 Hz
5
1 mm
4.7
800 nm
30 mJ
2
DARC
DARC
1 - 100 Pa
DARC
2
F (90 - 140 GHz), G (140 - 220 GHz), Y
(220 - 320 GHz)
1) W.B.Mori, T.Katsouleas, J.M.Dawson and
C.H.Lai, Phys. Rev. Lett. 74, 542 (1995).
2) C.H.Lai, R.Liou, T.C.Katsouleas, P.Muggli,
R.Brogle, C.Joshi and W.B.Mori, Phys. Rev.
Lett. 77, 4764 (1996)

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