Scope

1

2

• Scope
• 1. Ionization of molecules - ( MO-ADK theory)
• Alignment dependence imaging MOs (KSU
  data)
• (Experiments double ionization
  high-harmonic generation)
• Molecular clock Time is read from the
  kinetic energy release of the fragments with
  sub-fs accuracy
• Attosecond XUV IR laser physics
• how to extract lifetime of autoionizing states
• Stark effect of laser-assisted photoexcitations
• Probing electron dynamics in the time domain
• 3. Summary

3
APT-attosecond pulse train issues 130 as from the
plateau region the harmonics must be phase
locked two sources of asynchronism 1.short
and long paths, thus two bursts select short by
phase matching condition by focusing before the
gas jet and a diaphram after 2.different
harmonics, due to different recombination times,
linear chirp, limits the as pulse durations to
about 100as, need chirp compensation Relative
phases measured by two-photon, two color
ionizationssideband analysis--RABITT other
works trying to relate the harmonics to electron
dynamics HHG facts plateau region has positive
chirp for the short trajectory phase locked
in the cutoff region
4
z off the focus
presented by the Saclay group see Mairesse et al
PRL 93, 163901(04) also Science 302, 1540 (03)
5
The Milano group also made such studies using
short pulses with CEP stabilized
6
not cep sensitive
from simulation, PRL92,113904(04)
7
apt with 170as at Lund --simulation
8
From RABITT
amplitude shaping
phase shaping
APT pulses
9
APTIR
good HHG sharp harmonics
selecting the time of ionization by apt
schaffer et al PRL92, 023003(04) preliminary
data from U. Kellers group confirm the HHG
enhancement Lunds group measured the ATI
enhancement to higher electron energies
10
HHG as light sources

• Crete group, use 7th and 13th harmonics for
  cross correlation experiments

11
Attosecond electron bursts for imaging
industry?

• Corkum-
• Paulus use the phase information in the
  tunneling electrons for interference?
• M. Lezius-
• Ivanov theory for imaging by electrons (quite
  complicated, but not impossible)
• Villeneuve imaging thru HHG (N2 Nature04)
• Kietzer-ALLE

need to know e-wave packet better.
12
Krauszs recent work

• tried IR-pump/XUV probe signal too weak
• XUV pump/IR probe
• look at the time of shakeup electrons, rise
  time is about 4fs

13
The COLTRIMS people

• Doerner- e-e spectra, sequential, nonsequential,
  also circularly polarized, laser lab soon
• Moshammer double and multiple ionization
• cold recoil ions
• Helm- negative ions, atoms
• All good talks theory done by experimentalists
  mostly,
• S-matrix theory does not really work

14
HHG of molecules

• MarangnosItaly group
• alignment dependence, short and long pulses
  difference in H2 and D2

15
(No Transcript)
16
Activities-- Colloquium at Univ. of
Electrocommunications Seminar at RIKEN 1st talk
at the conference (more mixed audience) covered
alignment-depn ionization rates and imaging of
the electron cloud molecular cloud laser-assisted
autoionization
17
Intense XUV and soft X-ray source
Soft X-ray
0.33 ?J _at_ ? 29.6 nm (TiSapphire H27)

• Above-threshold ionization (ATI) of He
• Sekikawa et al., Nature 432, 605 (2004)
• h? 27.9 eV
• ATI Two-photon double ionization (TPDI) of He
• Hasegawa et al., Phys. Rev. A, in press Nabekawa
  et al., Phys. Rev. Lett., in press
• h? 41.8 eV

focused to an area of 10mm2 by a mirror Assuming
the pulse duration lt 30 fs
XUV
1014 W/cm2
Soft X-ray
Mashiko et al., Opt. Lett. 29, 1927 (2004)
18
High-order harmonic generation (HHG)

• RIKEN, Laser Technology Laboratory (K.
  Midorikawa)
• 25 nJ _at_ ? 13.5 nm (TiS H59)
• 0.33 ?J _at_ ? 29.6 nm (TiS H27)
• 1 ?J _at_ ? 54 nm (TiS H15)
• 4.7 ?J _at_ ? 62.3 nm (TiS H13)
• 7 ?J _at_ ? 72.7 nm (TiS H11)
• CEA-Saclay, DSM/DRECAM/SPAM (P. Salieres)
• 1.9 ?J _at_ ? 53.3 nm (TiS H15)
• University of Tokyo, ISSP (S. Watanabe)
• 1.2 ?J _at_ ? 49.7 nm (KrF Excimer H5)

Takahashi et al. Phys. Rev. A 66,
021802(2002) Opt. Lett. 27, 1920(2002) JOSA B 20,
158 (2003) Appl. Phys. Lett. 84, 4 (2004)
Hergott et al. Phys. Rev. A 66, 021801 (2002)
Yoshitomi et al. Opt, Lett. 27, 2170 (2002)
19
(No Transcript)
20
(No Transcript)
21
(No Transcript)