Off-axis retrieval of orbital angular momentum of light stored in cold atoms

Oliveira, Rafael A. de; Pruvost, Laurence; Barbosa, Patrícia; Martins, Weliton S.; Barreiro, S.; Felinto, D.; Bloch, Daniel; Tabosa, J. W. R.

doi:10.1007/s00340-014-5934-7

Cited by 8 publications

(3 citation statements)

References 23 publications

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“…Besides these recent demonstrations of classical communication using OAM modes, previous work reporting the storage and manipulation of OAM of light have also been published, both in the classical [7,8] and quantum regimes [9]. Also of considerable importance for communication schemes using OAM encoded information is the possibility of retrieving the stored information along different directions in space, as well as the manipulation, through higherorder nonlinearity, of the stored information, which have also been demonstrated [10,11]. Still in the context of communication based on encoded OAM information, another important issue is the possibility of amplification of the encoded signal, which according to our knowledge has not been demonstrated yet.…”

Section: Introductionmentioning

confidence: 96%

Narrow band amplification of light carrying orbital angular momentum

Borba,

Barreiro,

Pruvost

et al. 2016

Preprint

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We report on the amplification of an optical vortex beam carrying orbital angular momentum via induced narrow Raman gain in an ensemble of cold cesium atoms. A 20% single-pass Raman gain of a weak vortex signal field is observed with a spectral width of order of 1 MHz, much smaller than the natural width, demonstrating that the amplification process preserves the phase structure of the vortex beam. The gain is observed in the degenerated two-level system associated with the hyperfine transition 6S 1/2 (F = 3) ↔ 6P 3/2 (F = 2) of cesium. Our experimental observations are explained with a simple theoretical model based on a three-level Λ system interacting coherently with the weak Laguerre-Gauss field and a strong coupling field, including an incoherent pumping rate between the two degenerate ground-states.

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Section: Introductionmentioning

confidence: 96%

Narrow band amplification of light carrying orbital angular momentum

Borba,

Barreiro,

Pruvost

et al. 2016

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…reported the storage and retrieval of OAM of light in an atomic ensemble, both in the classical and quantum regimes [10][11][12]. On the other hand, for applications in communications systems it is also important to be able to manipulate the encoded information in OAM beams and we have demonstrated previously that one can perform mathematical operations on beams carrying different OAM using higher-order nonlinear susceptibility [13,14]. Still in this context, another important issue is the possibility of amplification of such laser beams.…”

Section: Introductionmentioning

confidence: 99%

Amplification and storage of light carrying orbital angular momentum via magnetically assisted gain in cold atoms

Moreira¹,

Carvalho²,

Tabosa³

2022

J. Opt.

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We report on the amplification and the storage of a light vortex beam carrying orbital angular momentum in an ensemble of cold cesium atoms in the presence of an external transverse magnetic field. This magnetically assisted optical gain was previously reported in a recent publication and originates from the manipulation of the induced dark state by the external magnetic field. Single pass optical gain exceeding $100\%$ was measured for beams with different topological charges. Furthermore, we also demonstrate the storage and retrieval of the vortex beams, showing that the amplification and the storage processes preserve the coherent nature of the optical vortex. A simple theoretical model based on density matrix numeric calculation and which accounts for the presence of the external magnetic field was developed and present qualitative agreement with the observed results. Owing to the recent proposal of using light carrying orbital angular momentum for efficient data transmission systems, we believe our results could find application in communications protocols involving distant nodes.

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“…Coherent manipulation of transverse multimode light fields, such as optical modes with representative transverse structures [1][2][3][4] or arbitrary optical images [5][6][7][8], via light-atom interaction is essential for the development of quantum optics and quantum information. External light or magnetic fields can modulate the optical response of the atoms, then change the absorption and dispersion of the optical field propagating through such media.…”

Section: Introductionmentioning

confidence: 99%

Angular dependence of spatial frequency modulation in diffusion media

et al. 2022

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An optical field will undergo coherent diffusion when it is mapped into thermal-motioned atoms, e.g., in a slow or storage light process. As was demonstrated before, such diffusion effect is equivalent to a spatial low-pass filter attenuating the high spatial frequency (SF) components of the optical field. Here, employing electromagnetically induced transparency (EIT) based light storage in hot atomic vapor, we demonstrate that the angular deviation between the control and probe beams could be utilized as a degree of freedom to modulate the SF of the probe beam. The principle is to change the diffusion-induced low-pass filter into a band-pass filter, whose SF response can be tuned by varying the direction and magnitude of the angular deviation. Transverse multimode light fields, such as optical images and Laguerre-Gaussian modes are utilized to study such SF modulation. Our findings could be broadly applied to the fields of quantum information processing, all-optical image manipulation and imaging through diffusive media.

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Off-axis retrieval of orbital angular momentum of light stored in cold atoms

Cited by 8 publications

References 23 publications

Narrow band amplification of light carrying orbital angular momentum

Narrow band amplification of light carrying orbital angular momentum

Amplification and storage of light carrying orbital angular momentum via magnetically assisted gain in cold atoms

Angular dependence of spatial frequency modulation in diffusion media

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