Radiation emitted by a resonantly driven hydrogen atom

LaGattuta, K. J.

doi:10.1103/physreva.48.666

Cited by 14 publications

(15 citation statements)

References 19 publications

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“…The first term on the right hand side corresponds I berg picture: x(t) = Ut(t)xU(t) with U(t) the evolution operator of the system. We would like to remark here that, had we analyzed the case of a rapidly evolving dipole, we would have arrived at a spectrum which is governed by the autocorrelation of the dipole acceleration [10,19,20,25]. In the present situation where we analyze the evolution within a two-level model and explicitly exclude ionization, it is straightforward to relate the acceleration autocorrelation to that of the dipole through a factor~4 (Ref.…”

Section: A General Expressionmentioning

confidence: 97%

“…The evolution operator is thus given by Hence the full spectrum, in the absence of a laser field, reduces to the incoherent spectrum related to the Quctuations of the dipole. In the case of a ground state preparation, the spectrum is then given by 20 FIG. 6.…”

Section: Acknowledc Mentsmentioning

confidence: 99%

“…We may now split the above coherent and incoherent parts with respect to the interatom coherence into their contributions of the coherent and incoherent parts with respect to intraatom coherence [19,20], i.e. , into the mean dipole and quantum Quctuation contributions.…”

Section: Multiatom Spectramentioning

confidence: 99%

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Role of initial coherence in the generation of harmonics and sidebands from a strongly driven two-level atom

et al. 1995

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We investigate the coherent and incoherent contributions of the scattering spectrum of strongly driven two-level atoms as a function of the initial preparation of the atomic system. The initial "phasing" of the coherent superposition of the excited and ground states is shown to inBuence strongly the generation of both harmonics and hyper-Raman lines. In particular, we point out conditions under which harmonic generation can be inhibited at the expense of the hyper-Raman lines. Our numerical 6ndings are supported by approximate analytical evaluations in the dressed state picture.

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Section: A General Expressionmentioning

confidence: 97%

Section: Acknowledc Mentsmentioning

confidence: 99%

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Role of initial coherence in the generation of harmonics and sidebands from a strongly driven two-level atom

et al. 1995

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“…Accordingly, their relative intensities will grow only as N, the number of active atomic centers in the sample, instead of N 2 for harmonics. However, as already noted by LaGattuta [20], they might be detected at another observation angles than the forward direction.…”

Section: (2)mentioning

confidence: 89%

“…The more involved situation of a model potential supporting an infinite number of bound states plus a continuum has been discussed in [17] and will be briefly presented below. Another recent discussion may be found in [20].…”

Section: (2)mentioning

confidence: 99%

High Order Harmonic Generation and Atomic Stabilization in Ultra-Intense Laser Pulses

1994

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We present results of recent numerical simulations on the non-linear response of a single-electron atom submitted to an intense laser pulse. We address both the questions of the light scattered by the atom and the possible stabilization against ionization. One of the results of our simulations is the the presence of hyper-Raman lines in the high-order harmonic spectra. We suggest that these lines could be a signature of atomic stabilization. PACS numbers: 32.80.Rm, 42.65.KyHigh-order harmonic generation by rare gas atomic targets and the possible stabilization of atoms in the presence of ultra-intense laser pulses have emerged, since the late eighties, as new topics in the field of multiphoton physics. Before, it was commonly accepted in the community that a bound atomic system could never experience the strong field strengths needed to observe these processes. More precisely, experimental evidences seemed to indicate that the higher the laser field strength, the larger the multiphoton ionization probabilities. It was observed in fact that, for haser pulses with durations comprised between 10 -9 s and a few picosecond, saturation occurred for ionization, i.e. a whole atomic sample was ionized in the higher intensity range. Accordingly, it was suggested that in an ultra-intense pulse the atoms would be ionized well before the intensity had reached its maximum [1]. It is interesting to note that, were this picture be correct, it would have implied that most multiphoton processes could be described within a mostly perturbative framework, as the non-perturbative regime could never be experienced by actual bound atomic systems. A consequence of this scenario would have been that only a few harmonics of the laser frequency, with exponentially decreasing intensities, could be generated by a strongly laser-driven atomic system.It is in the late eighties that it was first shown experimentally [2,3] that, in fact, the harmonic spectra do not display such a behaviour and that, on the contrary, they are characterized by a conspicuous plateau which can extend well beyond the 100th harmonic and is often followed by an abupt cut-off [4]. Understandably, this has attracted a lot of attention and many theoretical simulations, (191)

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