Dependence on light amplitude of the dynamic stark splitting of an optical line

Schabert, A.; Keil, R.; Toschek, P. E.

doi:10.1016/0030-4018(75)90096-6

Cited by 54 publications

(13 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Curves (c) and (d) show the experimental FM reflectivity spectra for a pump detuning of 3 and 0 GHz, respectively. In both cases one observes that the single resonance of curve (b) is split into an Autler-Townes doublet [25,26]. The asymmetry of the doublet in curve (c) reflects the fact that, for this curve, the pump laser is tuned slightly above the D 2 resonance transition, while the near-perfect symmetry of curve (d) shows that the pump laser is, in that case, tuned on resonance.…”

mentioning

confidence: 86%

Observation of narrow Autler-Townes components in the resonant response of a dense atomic gas

2008

View full text Add to dashboard Cite

We have experimentally studied the reflection of a weak probe beam from a dense atomic potassium vapor in the presence of a strong laser field tuned to the atomic resonance transition. We have observed an Autler-Townes doublet under hitherto unexplored conditions, namely that the Rabi frequency induced by the strong laser field is much smaller than the self-broadened width of the resonance transition of the unexcited vapor. We attribute our observation to a reduction of the atomic decoherence by the strong drive field. We present a theoretical model of nonlinear processes in a dense atomic gas to explain the observed results.PACS numbers: PACS numbers: 42.50.Hz, 42.50.Nn Spectral line broadening is a universal phenomenon and a multitude of techniques has been devised to reduce or eliminate it altogether, enabling the study of spectral features that would, otherwise, remain hidden [1,2,3,4]. In particular this applies to atomic or molecular gases where the collision rate can be made sufficiently small by, for instance, rarefying the vapor. However, when the interest lies with the (strongly) interacting gas, line broadening becomes the essence, and the study of the width of the fundamental resonance transitions in highdensity atomic vapors is well-documented [5,6]. Although, in the general case, the broadening of the resonance line has many contributions [7], for dense homogeneous gases, the major contribution is caused by the resonant dipole-dipole interaction between ground-and excited-state atoms of the same species, and is known as self-or resonance broadening [5,6]. The interaction is long range, so that already at reasonably modest densities of order 10 17 cm −3 one leaves the binarycollision regime and multi-perturber effects may come into play [6,8]. It has, for instance, been shown that the Zeeman effect is modified at atomic densities of this order [9]. We note that multi-perturber effects were observed in high presure buffer gas [10,11,12] when the duration of collisions cannot be neglected.In a high-density vapor the atom responds not just to the externally applied EM field but also to the field reradiated by other atoms in the vapor, i.e. it responds to the local field. As first shown by Lorentz, this causes the position of the resonance to be shifted [13]. During the last decade this local-field shift, named after Lorentz, has been studied by both frequency [14,15,16,17,18,19] and time-domain [20] techniques. It is proportional to the atomic density, and of the same order of magnitude as the line width [21].It has been predicted that the Lorentz local-field shift depends on the degree of (incoherent) excitation of the vapor [21,22], a prediction that stimulated the study of a variety of nonlinear optical phenomena in dense atomic vapors, such as piezophotonic switching and lasing without inversion [23]. The experimental demonstration of the excitation dependence of the Lorentz shift [17,19] brought to light that the self-broadened width itself is also excitation dependent, an effect that could be...

show abstract

mentioning

confidence: 86%

Observation of narrow Autler-Townes components in the resonant response of a dense atomic gas

2008

View full text Add to dashboard Cite

show abstract

“…One such measurement is the optical analogue of the Autler-Townes splitting [1], observed originally in the microwave domain. Following the work of Toschek and coworkers [2,3,4] there have been a number of studies of the Autler-Townes splitting in probe absorption, when a strong laser pump field drives a coupled transition in vapor cells or atomic beams [5,6,7,8,9,10]. The introduction of laser cooling techniques such as the Magneto-Optical Trap (MOT) for neutral atoms has afforded precision measurements and optical spectroscopy not limited by Doppler effects or transit time broadening.…”

mentioning

confidence: 99%

Autler-Townes spectroscopy of the5S1/2−5P3/2−44<

et al. 2003

View full text Add to dashboard Cite

We study nonlinear optical effects in the laser excitation of Rydberg states. 5S 1/2 and 5P 3/2 levels of 85 Rb are coupled by a strong laser field and probed by a weak laser tuned to the 5P 3/2 − 44D Rydberg resonance. We observe high contrast Autler-Townes spectra which are dependent on the pump polarization, intensity and detuning. The observed behavior agrees with calculations, which include the effect of optical pumping.PACS numbers: 42.50. Hz, 32.80.Rm, 32.80.Pj With the birth of laser spectroscopy in the late 60s, new classes of nonlinear optical phenomena could be explored. One such measurement is the optical analogue of the Autler-Townes splitting [1], observed originally in the microwave domain. Following the work of Toschek and coworkers [2,3,4] there have been a number of studies of the Autler-Townes splitting in probe absorption, when a strong laser pump field drives a coupled transition in vapor cells or atomic beams [5,6,7,8,9,10]. The introduction of laser cooling techniques such as the Magneto-Optical Trap (MOT) for neutral atoms has afforded precision measurements and optical spectroscopy not limited by Doppler effects or transit time broadening. Using frequency stabilized diode lasers, we extend previous Autler-Townes spectroscopy in MOTs [11,12,13] to a new domain by using a high-lying Rydberg state with the excitation scheme shown in Fig. 1. As a consequence, the decay rate associated with the final level is all but eliminated. This work represents a step towards driving ground state-Rydberg transitions, which has been proposed as the working element in quantum information storage schemes [14,15].The measurement is performed at 60 Hz inside a vapor cell MOT with a background pressure of 10 −10 Torr. In each experimental cycle, the MOT lasers are turned off for 150 µs and the pump and probe fields of duration 10 µs are switched on simultaneously. The pump couples the 5S 1/2 F = 3 ground state and the 5P 3/2 F ′ = 4 intermediate state (λ ≈ 780 nm, saturation intensity I sat =1.64 mW/cm 2 and decay rate γ 2 /2π=5.98 MHz,), while a linearly polarized probe field (λ ≈ 480 nm) weakly couples the intermediate state to the 44D Rydberg states. The pump beam is collimated to a FWHM of 2.2 mm after spatial filtering through a single mode optical fiber. The probe beam is focused to a size of 30 µm and aligned anti-parallel to the center of the pump beam. In this arrangement, the pump field intensity is approximately constant throughout the probe volume, and field inhomogeneity effects are minimized. The Zeeman shifts arising from the MOT magnetic field (gradient of 10 G/cm) are less than 2 MHz in the excitation volume, which is below the spectroscopic resolution. The probe laser is a frequency doubled external cavity diode laser locked to a temperature regulated and pressure tunable Fabry-Perot cavity. The Rydberg population (lifetime ≈ 60µs) is monitored by counting electrons (gate = 100 µs) which originate from thermal ionization of Rydberg states with a Multi-Channel Plate (MCP) detector. The det...

show abstract

“…The resonance curves have been calculated using the exact solution of the equations of motion (1)(2)(3)(4)(5)(6) for the stationnary atom-field system with two strong fields (Rabi frequencies 2 W1 and 2 w2) and also using the weak probe-field approximation (equation (8)).…”

Section: Calculated Curves -The Numerical Cal-mentioning

confidence: 99%

“…The experimental investigation of this effect has been carried out either in an atomic beam [2,3] or in a gas cell, inside a laser cavity [4,5] and outside [6,7]. These three experimental possibilities obviously correspond to very different theoretical situations.…”

mentioning

confidence: 99%

The optical autler-townes effect in doppler-broadened three-level systems

Delsart

Keller

1978

J. Phys. France

View full text Add to dashboard Cite

2014 On discute quelques propriétés de l'effet Autler-Townes optique tel qu'il est observé dans les systèmes à trois niveaux avec élargissement Doppler, et particulièrement la signification physique du dédoublement de raies observé, les conditions d'observation et l'écart de ce doublet, ainsi que les effets dus à un désaccord de fréquence du laser saturant. On propose une représentation graphique du phénomène, fondée sur la recherche de classes de vitesse en résonance, et on en déduit une discussion qualitative complète de l'effet; on montre en particulier que le doublet observé n'est pas vraiment un dédoublement de la résonance comme pour l'atome immobile, mais correspond à l'existence d'un trou de fréquence où le laser sonde ne voit aucune classe de vitesse en resonance. On applique ensuite cette méthode à des cas typiques qui correspondent à des systèmes réels à trois niveaux du néon. Les courbes théoriques obtenues à partir du calcul semi-classique utilisant la matrice densité permettent de confirmer les résultats qualitatifs de la discussion graphique. On montre, de plus, que l'approximation du premier ordre n'est pas suffisante pour de nombreux cas expérimentaux. L'ensemble de ces prédictions théoriques est ensuite confronté à une nouvelle expérience utilisant deux lasers à colorant, ainsi qu'à une expérience récemment publiée. L'accord entre théorie et expérience est tout à fait satisfaisant.Abstract. 2014 Some features of the optical Autler-Townes effect as observed in Doppler-broadened three-level systems, including the physical significance of the observed line splitting, the conditions for the observation of the doublet, the doublet separation and the detuning effects, are discussed in this paper. A graphical illustration of the phenomenon, based on a search for on-resonance velocity groups, is proposed which allows a complete qualitative discussion of the effect and shows that the observed doublet is not really a splitting of the resonance as for the atom at rest but rather corresponds to a frequency hole where the laser probe does not see any resonant velocity group. The method is applied to real three-level systems of neon as typical cases. A semi-classical densitymatrix calculation is performed numerically and definitely confirms the results of the qualitative graphical discussion ; furthermore it shows that, for many experimental situations, the first order approximation is inadequate. The observation of the Autler-Townes doublet in a new experiment using two dye lasers is reported. The experimental results and that of one of our previous experiments are compared with the theoretical predictions ; the agreement is quite satisfactory. LE JOURNAL DE PHYSIQUE TOME 39, AVRIL 1978, Classification Physics Abstracts 32.90 -32.80K1. Introduction. -The extension of the pioneering work of Autler and Townes [1] to the optical range has recently been the subject of a great deal of interest.The optical Autler-Townes effect or dynamic Stark splitting is most simply observed in a three-level atomic system inte...

show abstract

Dependence on light amplitude of the dynamic stark splitting of an optical line

Cited by 54 publications

References 5 publications

Observation of narrow Autler-Townes components in the resonant response of a dense atomic gas

Observation of narrow Autler-Townes components in the resonant response of a dense atomic gas

Autler-Townes spectroscopy of the5S1/2−5P3/2−44<

The optical autler-townes effect in doppler-broadened three-level systems

Contact Info

Product

Resources

About