kev hhg and sub femtosecond k-shell excitation. ( using ir (2.1 m) radiation source )
DESCRIPTION
keV HHG and Sub femtosecond K-shell excitation. ( using IR (2.1 m) Radiation Source ). Gilad Marcus The Department of Applied Physics , The Hebrew Universit y, Jerusalem, Israel. Tel Aviv, 2-4, December 2013. Acknowledgment. Ferenc Krausz 1 Reinhard Kienberger 1 - PowerPoint PPT PresentationTRANSCRIPT
keV HHG and Sub femtosecond K-shell excitation.
( using IR (2.1m) Radiation Source )
Gilad MarcusThe Department of Applied Physics,
The Hebrew University, Jerusalem, Israel
Tel Aviv, 2-4, December 2013
Acknowledgment
Xun Gu 1
Wolfram Helml 1
Yunpei Deng 1• Ferenc Krausz 1
• Reinhard Kienberger 1
• Robert Hartmann 2
• Takayoshi Kobayashi 3
• Lothar Strueder 4
1. Max Planck, Quantum Optic, Germany2. pnSensor GmbH, Germany3. University of Electro-Communications, Chofu, Tokyo,
Japan4. Max Planck, Extraterrestrial Physics, Germany
• Currently, the photon energy of atto-second pulses is limited to ~150 eV ( l~8 nm).
Pushing the HHG toward the x-ray regime Shorter attosecond pulses Access to the water-window (300-500 eV) Time resolved spectroscopy of inner-shell processes X-ray diffraction imaging with a better resolution
Re-colliding electrons with higher energies Laser induced diffraction imaging with better resolution
Motivation for keV HHG
Increasing the energy of the re-colliding electrons
I (PW/cm2) 0.15 0.5 1.0
λ (nm) 800 2100 800 2100 800 2100
Up (eV) 9.0 61.8 30 206 60 412
ħωmax (eV) 44 211 110 668 205 1321
2pU Il
By using a longer wavelengthwe can overcome the ionizationproblem
• Currently, the photon energy of atto-second pulses is limited to ~150 eV ( l~8 nm).
The 2-cycles IR source
15 fsec740 µJ1 kHz
Self CEP Stabilization
nm
OPA system output: Carrier wave-length: l=2.1mPulse duration: 15.7 fs (2 cycles)Pulse energy: 0.7 mJRep rate: 1000 Hz Automatically Carrier-envelope-phase-stabilized
wav
elen
gth,
nm
f-to-3f interferogram
2 cycles IR (2.1m) source
Long term (few hours) phase scanB.Bergues, et. al, New Journal of Physics 13, no. 6 ( 2011): 063010.
I. Znakovskaya, et al. PRL 108, no. 6 (2012): 063002.
High Harmonic Generation
THG FROG
compressor(bulk silicon)
Diagnostics for pulse compression measurement
THG FROG
focusing lens(CaF2, 250 mm)
High harmonic beam from N2
through 150nm Pd +500nm C
Ne/N2 gas target,pressure up to 3 bar!
PNCamera
keV high harmonics and K-shell excitation
THG FROG
compressor(bulk silicon)
Diagnostics for pulse compression measurement
THG FROG
focusing lens(CaF2, 250 mm)
keV high harmonics and K-shell excitation
High harmonic beam from N2
through 150nm Pd +500nm C
Ne/N2 gas target,pressure up to 3 bar!
PNCamera
Photon counting and photon’s energy resolving with the pnCCD
Two photons hittingtwo pixels.
The charge in each pixel is proportionalto the photon energy
Photon counting and photon’s energy resolving with the pnCCD
Charge from one photons, spilled into neighboring pixels
Photon counting and photon’s energy resolving with the pnCCD
Rejected as an error.Not a reasonable charge distribution
Cosmic ray trace
keV high harmonics and K-shell excitation
500 1000 15000
10
20
30
40
50
60
photons energy [eV]
coun
ts /
bin
500 1000 15000
10
20
30
40
50
60
photons energy [eV]
coun
ts /
bin
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
tran
smis
sion
0
0.1
0.2
0.3
0.4 (b)(a)
500 1000 15000
10
20
30
40
50
60
photons energy [eV]
coun
ts /
bin
500 1000 15000
10
20
30
40
50
60
photons energy [eV]
coun
ts /
bin
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
tran
smis
sion
0
0.1
0.2
0.3
0.4 (b)(a)
High harmonics spectrum from a neon gas target through 500nm aluminum
Same spectrum through additional 500nm of vanadium (a) or iron (b)
Vanadium L-edge Iron L-edge
200 400 600 800 1000 1200 1400 1600 1800 2000 2200100
101
102
103
104
photons energy [eV]co
unt /
bin
HHG (Ne)T (3bar Ne)T (500nm Al)
10-3
10-2
10-1
100
tran
smis
sion
1.6 keVCut off
G. Marcus, et. al, PRL 108, 023201.
Photon counting and photon’s energy resolving with the pnCCD
Two photons hittingtwo pixels.
The charge in each pixel is proportionalto the photon energy
Photon counting and photon’s energy resolving with the pnCCD
Real spectrum
Two pixels pseudo photons
keV high harmonics and K-shell excitation
500 1000 15000
10
20
30
40
50
60
photons energy [eV]
coun
ts /
bin
500 1000 15000
10
20
30
40
50
60
photons energy [eV]
coun
ts /
bin
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
tran
smis
sion
0
0.1
0.2
0.3
0.4 (b)(a)
500 1000 15000
10
20
30
40
50
60
photons energy [eV]
coun
ts /
bin
500 1000 15000
10
20
30
40
50
60
photons energy [eV]
coun
ts /
bin
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
tran
smis
sion
0
0.1
0.2
0.3
0.4 (b)(a)
High harmonics spectrum from a neon gas target through 500nm aluminum
Same spectrum through additional 500nm of vanadium (a) or iron (b)
Vanadium L-edge Iron L-edge
200 400 600 800 1000 1200 1400 1600 1800 2000 2200100
101
102
103
104
photons energy [eV]co
unt /
bin
HHG (Ne)T (3bar Ne)T (500nm Al)
10-3
10-2
10-1
100
tran
smis
sion
1.6 keVCut off
G. Marcus, et. al, PRL 108, 023201.
keV high harmonics and K-shell excitation
500 1000 150010
0
102
104
106
108
1010
Spectrum from Ne Target
photons energy [eV]
coun
ts /
bin
100 200 300 400 500 600
102
104
106
Spectrum from N2 Target
photons energy [eV]
coun
ts /
bin
Ne K-edge
NitrogenK-edge
keV high harmonics and K-shell excitation
Enhanced peak at the K-edge
Better phase matching conditionsdue to the absorption lines
Inner shell excitation followed by x-ray emission
0.5 1 1.5
0
0.5
1
/0
Re(n)Im(n)
keV high harmonics and K-shell excitation
Enhanced peak at the K-edge
Calculation shows: Plasmadispersion still dominate
Inner shell excitation followed by x-ray emission
0.5 1 1.5
0
0.5
1
/0
Re(n)Im(n)
keV high harmonics and K-shell excitation
Enhanced peak at the K-edge
Inner shell excitation followed by x-ray fluorescence
keV high harmonics and K-shell excitation
Enhanced peak at the K-edge
Inner shell excitation followed by x-ray fluorescence
2exdP ( ) / ( )i it D t dt =
2D
0exab
1 expSA P4
radav L
Aa
ub
ddt f L
=
0
rad Au
- in-elastic excitation cross sectionD - electron wave packed radius
- ionization rate- gas density
, - dacay rates (radiation , Auger)
keV high harmonics and K-shell excitation
Enhanced peak at the K-edge
Inner shell excitation followed by x-ray fluorescence
2exP ( ) / ( )i it D t dt =
2D
0exab
1 expSA P4
radav L
Aa
ub
ddt f L
=
0 1 2 3 4
0
16
32
48
64
80
pressure [bar]
phot
on y
ield
0 1 2 3 40
20
40
60
80
100
120
140
160
180
pressure [bar]
phot
on y
ield
[cou
nts
/ sec
]
keV high harmonics and K-shell excitation
Enhanced peak at the K-edge
Inner shell excitation followed by x-ray fluorescence
2exP ( ) / ( )i it D t dt =
2D
0exab
1 expSA P4
radav L
Aa
ub
ddt f L
=
0 1 2 3 4
0
16
32
48
64
80
pressure [bar]
phot
on y
ield
0 1 2 3 40
20
40
60
80
100
120
140
160
180
pressure [bar]
phot
on y
ield
[cou
nts
/ sec
]
keV high harmonics and K-shell excitation
Enhanced peak at the K-edge
Inner shell excitation followed by x-ray fluorescence
x 0edP ( ) ( ) ( ) ( )i
i it
t t dt v v d
=
2D
eab
0xS 1 expA dP
4rad
av LA
abu
L df
=
0 1 2 3 4
0
16
32
48
64
80
pressure [bar]
phot
on y
ield
0 1 2 3 40
20
40
60
80
100
120
140
160
180
pressure [bar]
phot
on y
ield
[cou
nts
/ sec
]
0 0.5 1 1.5 2 2.5 3 3.5 40
50
100
150
pressure [bar]
phot
on y
ield
0 2 4
0
2
4
keV high harmonics and K-shell excitation
Inner shell excitation followed by x-ray fluorescence
Thank you