Monte Carlo simulation of field fluctuations in strongly driven resonant transitions

Jc, Camparo; Lambropoulos, P.

doi:10.1103/physreva.47.480

Cited by 21 publications

(7 citation statements)

References 32 publications

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“…In the following we explore the influence of fluctuations on the frequency response of atoms. Analogous studies in the past have focused on stationary fields, i.e., for time-independent I s (t) [3,6,8], while most of them considered exponentially correlated fluctuations. In the present SASE-FEL facilities such conditions are not satisfied, and the ensemble average intensity I s (t) has a finite duration τ s .…”

Section: Stationaritymentioning

confidence: 99%

“…The effects of field fluctuations on nonlinear photointeraction processes were discussed extensively during the late 1970s through the 80s, which led to the development of a number of theoretical approaches capable of addressing essentially any arrangement of atomic levels, including the continuum, coupled to one or more radiation fields involving fluctuations [3][4][5][6][7][8]. The relevant laser sources of that period, although pulsed, were of relatively long duration, in the range of nanoseconds to tens of picoseconds, as a result of which they could to a good approximation be viewed as stationary.…”

Section: Introductionmentioning

confidence: 99%

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Effects of free-electron-laser field fluctuations on the frequency response of driven atomic resonances

Nikolopoulos¹,

Lambropoulos²

2012

Phys. Rev. A

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We study the effects of field fluctuations on the total yields of Auger electrons, obtained in the excitation of neutral atoms to a core-excited state by means of short-wavelength free-electron-laser pulses. Beginning with a self-contained analysis of the statistical properties of fluctuating free-electron-laser pulses, we analyze separately and in detail the cases of single and double Auger resonances, focusing on fundamental phenomena such as power broadening and ac Stark (Autler-Townes) splitting. In certain cases, field fluctuations are shown to influence dramatically the frequency response of the resonances, whereas in other cases the signal obtained may convey information about the bandwidth of the radiation as well as the dipole moment between Auger states.

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Section: Stationaritymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of free-electron-laser field fluctuations on the frequency response of driven atomic resonances

Nikolopoulos¹,

Lambropoulos²

2012

Phys. Rev. A

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“…A trivial example is the broadening of spectral features as a result of the finite spectral width of the light [1]. The study of the detailed influence of light fluctuations in the light-atom interaction has motivated a large amount of research [1,2,3,4,5,6,7,8,9,10,11,12,13]. In some cases, the light fluctuations are modelled as classical stochastic processes [2], in other cases a fully quantum approach is required [4,5].…”

mentioning

confidence: 99%

Noise spectroscopy of nonlinear magneto-optical resonances in Rb vapor

Martinelli

Valente²,

Failache³

et al. 2004

Phys. Rev. A

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Nonlinear magneto-optical (NMO) resonances occurring for near-zero magnetic field are studied in Rb vapor using light-noise spectroscopy. With a balanced detection polarimeter, we observe high contrast variations of the noise power (at fixed analysis frequency) carried by diode laser light resonant with the 5S 1/2 (F = 2) → 5P 1/2 (F = 1) transition of 87 Rb and transmitted through a rubidium vapor cell, as a function of magnetic field B. A symmetric resonance doublet of anticorrelated noise is observed for orthogonal polarizations around B = 0 as a manifestation of ground state coherence. We also observe sideband noise resonances when the magnetic field produces an atomic Larmor precession at a frequency corresponding to one half of the analysis frequency. The resonances on the light fluctuations are the consequence of phase to amplitude noise conversion owing to nonlinear coherence effects in the response of the atomic medium to the fluctuating field. A theoretical model (derived from linearized Bloch equations) is presented that reproduces the main qualitative features of the experimental signals under simple assumptions.

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“…The present work focuses on the influence of fluctuations on the frequency response of a single Auger resonance. Previous studies on the same problem pertained to stationary fields i.e., for time-independent I s (t) [7,8,25], while most of them considered exponentially-correlated fluctuations. Such conditions, however, are not satisfied in the present SASE-FEL facilities, and the ensemble average intensity I s (t) has a finite duration τ .…”

Section: Single Auger Resonancementioning

confidence: 99%

Frequency response of an atomic resonance driven by weak free-electron-laser fluctuating pulses

Nikolopoulos¹,

Lambropoulos²

2013

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. Motivated by recent experiments pertaining to the interaction of weak SASE-FEL pulses with atoms and molecules, we investigate the conditions under which such interactions can be described in the framework of a simple phase-diffusion model with decorrelated atom-field dynamics. The nature of the fluctuations that are inevitably present in SASE-FEL pulses is shown to play a pivotal role in the success of the decorrelation. Our analysis is performed in connection with specific recent experimental results from FLASH in the soft X-ray regime.

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Monte Carlo simulation of field fluctuations in strongly driven resonant transitions

Cited by 21 publications

References 32 publications

Effects of free-electron-laser field fluctuations on the frequency response of driven atomic resonances

Effects of free-electron-laser field fluctuations on the frequency response of driven atomic resonances

Noise spectroscopy of nonlinear magneto-optical resonances in Rb vapor

Frequency response of an atomic resonance driven by weak free-electron-laser fluctuating pulses

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