Investigation of photon emission spectra of hydrogen using intense subpicosecond Ti:sapphire/Nd:glass laser pulses

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High harmonic conversion efficiency has been experimentally compared in the atomic gas Ar and the diatomic molecular gases O 2 and N 2 . It is shown that, in the saturation region, if the atomic and diatomic molecular gases have similar polarizabilities, the one with the higher ionization potential has the higher harmonic efficiency. If the atomic and molecular gases have similar polarizabilities and ionization potentials, the atomic gas will have a higher harmonic efficiency than the molecular one.

Section: Discussionmentioning

confidence: 99%

Comparison of high harmonic conversion efficiency in atomic and diatomic molecular gases

Liang¹,

Talebpour²,

Chien³

et al. 1997

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“…High-order HG in molecular gases is a relatively new field of research (Liang et al 1995, Lynga et al 1996 as well as in clusters and surfaces (Donnelly et al 1996, Dobosz 0953-4075/98/184243+13$19.50 c 1998IOP Publishing Ltd et al 1997. The HG cut-off law is now well understood to be the consequence of the laserinduced recollision of the ionized electron with the parent ion (Corkum 1993, Krause et al 1992, Watson et al 1997.…”

Section: Introductionmentioning

confidence: 99%

High-order harmonic generation at long range in intense laser pulses

Bandrauk

1998

The physics of high-order harmonic generation in single-electron molecular ions at long range (large internuclear distances) is examined by exact numerical solutions of the three-dimensional time-dependent Schrödinger equation. These numerical solutions show that photon energies can be produced with energies exceeding the atomic cut-off law I p +3U p , where I p is the ionization energy and U p is the ponderomotive energy. It is shown that preferential high-order harmonic generation occurs at critical distances R c = α 0 , (π/2)α 0 and πα 0 , where α 0 is the ponderomotive radius, by collision of electrons with neighbouring ions as opposed to recollision with the parent ion. The most efficient harmonic generation occurs at (π/2)α 0 due to less electron wavefunction expansion.

“…It is recorded by using a CCD camera with an array of 165V × 192H points in the vertical (V) and horizontal (H) direction, respectively. For further details of the experimental set-up we refer to [33,34]. An example of the radiation spectrum taken by the CCD camera is shown in figure 2 (upper panel), the horizontal direction corresponds to the wavelength axis.…”

mentioning

confidence: 99%

Laser-induced inner shell vacancies in doubly ionized argon

Becker

Faisal

Liang

et al. 2000

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The creation of laser-induced inner shell vacancies in doubly ionized Ar atoms is reported. First, theoretical calculations are performed for different laser systems and as much as 30% of doubly ionized Ar atoms in the [Ne]3s3p 5 configuration with a 3s shell vacancy at optical and near-infrared frequencies are predicted. Analysis of the results shows that the mechanism for creation of the inner shell vacancy is a non-sequential double ionization process. Finally, the radiation spectrum of Ar in the field of an intense Ti:sapphire/Nd:glass laser system at 1053 nm has been measured, and the line corresponding to the fluorescence emission due to radiative filling of the created inner vacancy in the 3s shell is observed.