Honeycomb Pattern Formation by Laser-Beam Filamentation in Atomic Sodium Vapor

Bennink, Ryan S.; Wong, Vincent; Marino, Alberto M.; Aronstein, David L.; Boyd, Robert W.; Stroud, C. R.; Lukishova, Svetlana G.; Gauthier, Daniel J.

doi:10.1103/physrevlett.88.113901

Cited by 53 publications

(19 citation statements)

References 41 publications

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“…This regime valid for larger optical thickness will be considered in this letter. Note that in contrast to past observation of pattern formation in hot atomic vapors [19,20] the instabilities based on the coupling to the atomic motion do not require non linear optical response of the atoms.…”

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confidence: 81%

Observation of a Cooperative Radiation Force in the Presence of Disorder

et al. 2010

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We show that static and oscillating photon bubbles can be excited by diffused light in the laser cooled matter confined in a magneto-optical trap (MOT). The bubble instability is due to the coupling between the radiation field and the mean field oscillations of the ultra-cold gas, and it can provide a source for low frequency turbulence. We consider a diffusion dominated regime, which can be described by a radiation transport equation, coupled with the mean field equations for the cold atom gas. A perturbative analysis shows the occurrence of two different regimes with either oscillating or purely growing bubbles. This work could also be useful to understand similar processes in astrophysics.

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confidence: 81%

Observation of a Cooperative Radiation Force in the Presence of Disorder

et al. 2010

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“…1, in which, large detuning of the pump 1 and the pump 2 is needed for high conversion efficiency. The noise is mainly from pump 2 field due to the pattern formation with high power [15]. It is worth illustrating that the polarization of the pump fields and signal field affect obviously the efficiency of conversion.…”

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confidence: 99%

Efficient infrared upconversion via a ladder-type atomic configuration

Ding

Zhou

Shi

et al. 2012

Journal of Modern Optics

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We experimentally demonstrate infrared light at 1529.4nm can be converted into the visible at 780nm with 54% efficiency through a ladder-type atomic configuration in 85 Rb. In particular, theoretically, we analyze the high efficiency is due to the large nonlinear dispersion of the index of refraction from the off-resonant enhancement in four-wave mixing process. By using two perpendicular polarized pump fields, the coherence of two FWM processes in this configuration is verified.Four-wave mixing (FWM) is a nonlinear optical process in which three fields are coherently interacted to generate a fourth field in a medium. This nonlinear process has an important application: efficient field up-conversion from the infrared spectrum to the visible [1]. The nonlinear parametric interaction processes in atoms with substantial efficiency should satisfy the phase matching condition. Efficient frequency up-conversion should occur within phase matching lengths, otherwise, the generated field decrease rapidly with the polarization produced by the signal fields, resulting in destructive interference and low conversion [2].FWM with high efficiency in a double  system [3, 4, 5] or a diamond configuration [6] has been obtained. Recently, Hsu et al. have demonstrated the generation of a field with a conversion efficiency of 5% in a double-ladder system through resonant FWM in a hot atomic vapor cell [7], and this process is theoretical analyzed in detail in Ref. 8 and 9. In these works, two lasers with wavelength of 794.3 nm and a laser with wavelength of 852.2 nm are used to generate a field at 852.2 nm. Willis et al. performed a FWM experiment in a diamond-type atomic level configuration in a warm rubidium (Rb) vapor [10]. In their experiment, three lasers with wavelengths of 780 nm, 795 nm and 1324 nm were used to generate a field at 1367 nm. The maximum conversion efficiency they achieved was about . So the high efficiency of 54% achieved in hot atomic vapor cell using a ladder-type configuration in our experiment is an important advance in nonlinear optical process. Our experiment is performed using a Ladder-type in hot atoms, which is different to Ref. 6 where the complex cooling system is used. In addition, we use this ladder-type configuration to perform correlated photon pairs generated experiment [11], cascade image transfer [12] and linear conversion of orbital angular momentum [13].A problem needed to be resolved is how to enhance the nonlinear susceptibility and eliminate resonant absorption of the atom to the generated field in FWM. Ref.[4] reports a work of enhancing nonlinear susceptibility and reducing linear susceptibility using coherent properties. In this report, we demonstrate an up-conversion nonlinear wave mixing process with high efficiency in hot 85 Rb atomic vapor cell, where the infrared field at 1529.4nm is converted to the visible field at 780nm. Within our configuration, the frequencies of all fields are off-resonant with respect to the atomic transitions. Hence, the generated field decouples to ...

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“…It has been reported that the atomic coherence can significantly enhance and modify the cross-Kerr nonlinearities [1,3], which are essential in generating large refractive index modulation [4]. With the nonlinear refractive index changed, laser induced focusing [5] and pattern formation [6] have been extensively investigated with two laser beams propagating in atomic vapors.…”

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confidence: 99%

Dressed four-wave mixing and multi-order fluorescence signals

et al. 2014

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We mainly investigate four generated four-wave-mixing (FWM) signals, and second-and fourth-order fluorescence (FL) signals, simultaneously in a cascade three-level atomic system of sodium, in which dual electromagnetically induced transparency windows are used to enable transparency of the generated FWM signals. The moving and immobile two-photon dressing effects on the FWM and multi-order FL signals as well as the interaction of dressing effects are studied. Furthermore, we investigate the spontaneous parametric FWM signal and spatial images of the transmitted probe signal modulated by the cross-Kerr nonlinearities effect of the dressing field both experimentally and theoretically. The study may find applications in all-optical communication.

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Honeycomb Pattern Formation by Laser-Beam Filamentation in Atomic Sodium Vapor

Cited by 53 publications

References 41 publications

Observation of a Cooperative Radiation Force in the Presence of Disorder

Observation of a Cooperative Radiation Force in the Presence of Disorder

Efficient infrared upconversion via a ladder-type atomic configuration

Dressed four-wave mixing and multi-order fluorescence signals

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