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Electron Energy Spectra from the Strong-Field Double-Ionization of Xenon

100%

Chaloupka J., Lafon R., Rudati J., Sheehy B., Agostini P., Kulander K., DiMauro L.

Acta Physica Polonica A

2002

vol. 101

issue 3

337-346

The electron energy spectra correlated to the strong-field double-ionization of xenon are presented at three laser intensities. The double-ionization electrons are on average more energetic than those generated from single-ionization. This difference in energy is not manifested as a simple scaling to higher electron energies, but rather as a change in the shape of the spectra. This trend is observed at all intensities. Most notably, the comparison between single- and double-ionization spectra is very similar at low and high peak laser intensities. This could imply that a sequential double-ionization process dominates at all intensities, even where the double ion yield is enhanced.

U_{P}, 3U_{P}, 11U_{P}: Above-Threshold Ionization Revisited

100%

Yang B., Schafer K. J., Walker B., Kulander K. C., Dimauro L. F., Agostini P.

Acta Physica Polonica A

1994

vol. 86

issue 1

41-50

Angular distributions of very high energy photoelectrons from Xe and Kr, excited by a 50 ps, 1054 um laser, are presented. In Xe strong, narrow structures 45° off the polarization axis appear on above-threshold ionization peaks within a limited energy range centered around 9U_{P}, where U_{P} is the intensity-dependent ponderomotive energy. Under the same conditions the effect is much weaker in krypton. These structures are discussed using a very simple classical model as well as sophisticated single active electron calculations and the Keldysh-Faisal-Reiss theory. We conclude these structures are the result of single-electron dynamics involving rescattering of a tunneling component of the continuum wave function.

Towards Attosecond Pulses with High Harmonics

84%

Agostini P., Paul P., Breger P., Toma E., Muller H., Mullot G., Augé F., Balcou P.

Acta Physica Polonica A

2002

vol. 101

issue 3

313-324

The high harmonics produced by focusing an intense femtosecond laser in a gas are theoretically shown to be locked in phase. The physics of this locking is discussed and a new method based on quantum interference in two-photon, two-color ionization allowing to retrieve the relative phase of harmonic pairs is described. The main result is that the 5 harmonics of orders 11-19 produced in argon generate a train of subfemtosecond pulses with a period of 1.35 fs and a duration of 250 attoseconds.

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3 Acta Physica Polonica A

2 2002

1 1994

3 Agostini P.

1 Augé F.

1 Balcou P.

1 Breger P.

1 Chaloupka J.

1 DiMauro L.

1 Dimauro L. F.

1 Kulander K.

1 Kulander K. C.

1 Lafon R.

1 Muller H.

1 Mullot G.

1 Paul P.

1 Rudati J.

1 Schafer K. J.

1 Sheehy B.

1 Toma E.

1 Walker B.

1 Yang B.

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Electron Energy Spectra from the Strong-Field Double-Ionization of Xenon

U_{P}, 3U_{P}, 11U_{P}: Above-Threshold Ionization Revisited

Towards Attosecond Pulses with High Harmonics