Compensating Doppler broadening with light-shifts

Cohen‐Tannoudji, Claude; Hoffbeck, F.; Reynaud, Serge

doi:10.1016/0030-4018(78)90176-1

Cited by 29 publications

(14 citation statements)

References 17 publications

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“…This type of sub-Doppler spectrum is characterized by a large detuning from the intermediate resonance, measuring the fluorescence from the upper level as well as by small cross sections for these multi-photon processes. Enhanced by intermediate resonance sub-Doppler processes based on the use of strong driving fields and on a change of frequency-correlation properties of resonant multi-photon process in strong resonant fields, have been proposed in [3] and further developed in [5,6] (also in [2]). Substantial enhancement in absorption, gain and fluorescence controlled with the auxiliary appropriately propagating electro-magnetic wave has been predicted.…”

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confidence: 99%

Sub-Doppler resolution controlled by two coherent driving fields

Dong

Popov

Tang

et al. 2001

Optics Communications

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We propose a four-level model where sub-Doppler resolution as well as enhanced absorption of a weak probe field are realized by using two coherently driving fields. We show that spectral resolution can be improved by modifying the coherent fields intensity and frequencies. PACS number(s): 42.50. Hz, 42.50.Ct, 42.50.Gy I IntroductionMulti-photon transitions are embedded in a variety of optical effects based on correlated absorption and emission of two or more photons.Step-wise and multi-photon processes can be distinguished by their frequencycorrelation properties [1,2]. Sub-Doppler resolution for an inhomogeneously broadened medium based on multi-photon processes has attracted much attention in recent decades. The physical essence for this method lies in the fact that a detuning for multi-photon transition stipulated by Doppler frequency shift can be reduced or eliminated by adopting appropriate light propagation direction, since the detuning is the sum or difference of multiple single-photon transition detunings. Sub-Doppler nonlinear optical resonance as appearance of quantum coherence and interference in the context of frequency-correlation properties of the coherent components have been proposed in [3]. A widely used method is Doppler-free two-or multi-photon absorption where the velocity dependent detuning could be removed in the case that the wave vectors of the interacting beams sum down to zero (for a review, see [4]). This type of sub-Doppler spectrum is characterized by a large detuning from the intermediate resonance, measuring the fluorescence from the upper level as well as by small cross sections for these multi-photon processes. Enhanced by intermediate resonance sub-Doppler processes based on the use of strong driving fields and on a change of frequency-correlation properties of resonant multi-photon process in strong resonant fields, have been proposed in [3] and further developed in [5,6] (also in [2]). Substantial enhancement in absorption, gain and fluorescence controlled with the auxiliary appropriately propagating electro-magnetic wave has been predicted. An interference nature of the spectrum modification has been stressed, which implies that along the growth of the absorption (gain) in certain spectral intervals, integral over the frequency may even decrease. A role of increase of intensity of a probe field as well as features of Doppler-free lasers were explored too.Control of atomic response with intense coupling lasers has been a subject of many intensive studies in the context of electromagnetically induced transparency (EIT) [7], amplification without inversion (AWI) [8,9,10,11], enhancement of the refractive index without absorption [12] and so on (for review see [8,11,13]). SubDoppler resolution by using intense coherently driving field(s) at other transition(s) has been recently further explored in [14,15]. In Ref. [14] probe weak field absorption spectrum in three-level schemes was considered. It was pointed out that the linewidth of one of the two Autler-Townes absorptio...

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confidence: 99%

Sub-Doppler resolution controlled by two coherent driving fields

Dong

Popov

Tang

et al. 2001

Optics Communications

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“…3 Nevertheless the results of Ref. 2 have been recently reported 4 to be in disagreement with the total-cross-section measurements and with the first differentialcross-section measurements of (l). 4 To my knowledge there are no previously published calculations which yield agreement with these measurements.…”

Section: Excitation Of Atomic Hydrogen To the N = 2 State By Helium Ionsmentioning

confidence: 89%

Experimental Evidence for Compensation of Doppler Broadening by Light Shifts

et al. 1979

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The possibility of compensating Doppler broadening of spectral lines by velocity-dependent light shifts 1 " 3 is illustrated with the following example of a three-level system a-b-c [Fig c l(a)] 0 Suppose that one analyzes the spectral profile of the light emitted by atoms excited in level c (for example, by a discharge) around the frequency o> 0 ' of the transition c-a* Simultaneously, the atomic vapor is irradiated by an intense single-mode laser beam, with frequency co x close to the frequency co 0 of the transition b-a. For an atom moving with velocity v in the laboratory frame [ Fig, 1(b)], the laser frequency in its rest frame [ Fig. 1(c)] is Doppler shifted from oo L to Q L = u) L (1 + v/c). The laser radiation perturbs the energy levels of such an atom, inducing "light shifts" 4 which depend not only on the laser intensity, but also on the detuning of the apparent laser frequency G> L , seen by the atom in its rest frame, from the atomic frequency. Since cD L is 4

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“…Compensation of the Doppler shifts with light shifts was proposed in [28,31,32]. Opportunities for great enhancement of various optical processes with this effect were recently investigated in more detail in [33,34,35,36,37].…”

Section: Nonlinear Interference Effects In Absorption and Amplifimentioning

confidence: 99%

Nonlinear interference effects and all-optical switching in optically dense inhomogeneously broadened media

2005

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Manipulative resonant nonlinear optics: nonlinear interference effects and quantum control of nonlinearity, dispersion, transparency and inversionless amplification in an extended strongly-absorbing inhomogeneously-broadened medium Specific features of nonlinear interference processes at quantum transitions in near-and fullyresonant optically-dense Doppler-broadened medium are studied. The feasibility of overcoming of the fundamental limitation on a velocity-interval of resonantly coupled molecules imposed by the Doppler effect is shown based on quantum coherence. This increases the efficiency of nonlinearoptical processes in atomic and molecular gases that possess the most narrow and strongest resonances. The possibility of all-optical switching of the medium to opaque or, alternatively, to absolutely transparent, or even to strongly-amplifying states is explored, which is controlled by a small variation of two driving radiations. The required intensities of the control fields are shown to be typical for cw lasers. These effects are associated with four-wave mixing accompanied by Stokes gain and by their interference in fully-and near-resonant optically-dense far-from-degenerate double-Lambda medium. Optimum conditions for inversionless amplification of short-wavelength radiation above the oscillation threshold at the expense of the longer-wavelength control fields, as well as for Raman gain of the generated idle infrared radiation, are investigated. The outcomes are illustrated with numerical simulations applied to sodium dimer vapor. Similar schemes can be realized in doped solids and in fiber optics.

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Compensating Doppler broadening with light-shifts

Cited by 29 publications

References 17 publications

Sub-Doppler resolution controlled by two coherent driving fields

Sub-Doppler resolution controlled by two coherent driving fields

Experimental Evidence for Compensation of Doppler Broadening by Light Shifts

Nonlinear interference effects and all-optical switching in optically dense inhomogeneously broadened media

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