Accumulative effects in the coherence of three-level atoms excited by femtosecond-laser frequency combs

Felinto, D.; Acioli, L. H.; Vianna, S. S.

doi:10.1103/physreva.70.043403

Cited by 60 publications

(49 citation statements)

References 21 publications

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“…Obviously, Eqs. (21)- (23) correspond to a Λ-type atom where the dressed state |D is practically decoupled from the two fields and the dark field is, accordingly to its definition (14), Ω D (ζ, τ ) 0, reducing thus the problem of a three-to a two-level atom. Hence, for initially matched pulses in the limit of weak probe field, Ω p0 Ω c0 , we obtain that the atomic system reaches a dark state where Ω D (ζ, τ ) 0 and the temporal profile of probe and coupling laser pulses does not change at any optical depth, f p (ζ, τ ) = f c (ζ, τ ) = f p (ζ = 0, τ ), and therefore the medium becomes transparent to both lasers [17].…”

Section: Maxwell-schrödinger Equations In the Dressedmentioning

confidence: 99%

“…(12) and (13) with respect to time, τ , and using the probability amplitude equations (5)- (7) and dressed fields' definitions (14) and (15) we obtain the following set of probability amplitude equations in the new basis of the dressed states:…”

Section: Maxwell-schrödinger Equations In the Dressedmentioning

confidence: 99%

“…So far most of the studies on the Λ-type system with a femtosecond laser pulse train have been done, without taking into account the propagation effects, either by assuming the presence of a stationary state [13] or a weak laser field when the lowest order perturbation theory is applicable [14]. As for the work with propagation effects taken into account, a closed Λ-type system with a degeneracy in the two lower states has been theoretically investigated with a femtosecond laser pulse train [15], when the single laser pulse train acts as both probe and coupling laser pulses due to the degeneracy of the system under consideration.…”

Section: Introductionmentioning

confidence: 99%

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Propagation of two short laser pulse trains in a Λ-type three-level medium under conditions of electromagnetically induced transparency

Buică¹,

Nakajima²

2014

Optics Communications

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We investigate the dynamics of a pair of short laser pulse trains propagating in a medium consisting of three-level Λ-type atoms by numerically solving the Maxwell-Schrödinger equations for atoms and fields. By performing propagation calculations with different parameters, under conditions of electromagnetically induced transparency, we compare the propagation dynamics by a single pair of probe and coupling laser pulses and by probe and coupling laser pulse trains. We discuss the influence of the coupling pulse area, number of pulses, and detunings on the probe laser propagation and realization of electromagnetically induced transparency conditions, as well on the formation of a dark state.

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Section: Maxwell-schrödinger Equations In the Dressedmentioning

confidence: 99%

Section: Maxwell-schrödinger Equations In the Dressedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Propagation of two short laser pulse trains in a Λ-type three-level medium under conditions of electromagnetically induced transparency

Buică¹,

Nakajima²

2014

Optics Communications

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“…The calculation is based on the model by Felinto [7,8]. The Felinto model starts with the optical Bloch equations for excitation of rubidium 5s, 5p, and 5d manifolds.…”

Section: Model Descriptionmentioning

confidence: 99%

Calculation of ionization in direct-frequency comb spectroscopy

2012

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Direct-frequency comb spectroscopy (DFCS) is currently the highest-resolution absolute frequency spectroscopic technique known. In general, one does DFCS by scanning the repetition rate, f rep , of a comb laser and measuring fluorescence from the excited states of the species under study. The technique has already been successfully characterized by a theoretical model that starts with the optical Bloch equations and, with a few simplifying assumptions converts them into linear coupled iterative equations. In the present work we build on that successful model to predict the characteristics of the ion yield from photoionization by the comb laser, as a function of f rep . We show that the ion spectrum yields the same atomic structure as the fluorescence spectra, but with greater efficiency.

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“…Those experimental results have been placed on firm theoretical ground. 7,8 Considering that a frequency comb is a train of femtosecond pulses having high peak intensity, it is reasonable to ask if, in addition to the excitation, do frequency combs also significantly ionize the system. While this process has recently been investigated theoretically, 9,10 to our knowledge, it has not been investigated experimentally.…”

Section: Introductionmentioning

confidence: 99%

Measurement of ionization in direct frequency comb spectroscopy

Lomsadze

Fehrenbach

DePaola

2013

Journal of Applied Physics

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Direct frequency comb spectroscopy is currently one of the most precise techniques for studying the internal structure of atomic and molecular systems. In this technique, a train of ultrafast laser pulses excites states in the target system which then relax, emitting fluorescence. The measured fluorescence is then plotted as a function of the comb parameters. But according to recent theory, the ultrashort pulses from the comb laser can also significantly ionize the target. Here, we test this theory by measuring the ion signal from direct frequency comb spectroscopy. Furthermore, instead of actively controlling the frequency comb parameters, we allow them to drift passively, measuring them and the ion signal simultaneously. The experiments were found to be in satisfactory agreement with theory, and the passive comb approach was found to be functional, though not as convenient as the conventional actively locked comb. V C 2013 American Institute of Physics.

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Accumulative effects in the coherence of three-level atoms excited by femtosecond-laser frequency combs

Cited by 60 publications

References 21 publications

Propagation of two short laser pulse trains in a Λ-type three-level medium under conditions of electromagnetically induced transparency

Propagation of two short laser pulse trains in a Λ-type three-level medium under conditions of electromagnetically induced transparency

Calculation of ionization in direct-frequency comb spectroscopy

Measurement of ionization in direct frequency comb spectroscopy

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