We experimentally investigate the frequency conversion of vector beams with four-wave-mixing (FWM) in rubidium vapor. The conversion of vector beams from the probe beam to the conjugate beam is realized. In FWM experiments, the pump and the probe beam have orthogonal polarizations because of the polarization sensitivity of the FWM process and detection convenience. In order to satisfy the polarization sensitive phase matching condition and realize the nonlinear frequency conversion of vector beams, a Sagnac interferometer is used to form two FWM processes in the same rubidium cell, and two generated conjugate beams are combined with a polarizing beam splitter to form a conjugate vector beam. The experimental results agree well with our theoretical simulation. Compared with nonlinear optical crystals, the atomic vapor provides another platform to control and manipulate the vector beams nonlinearly.We experimentally investigate the frequency conversion of vector beams with four-wave-mixing (FWM) in rubidium vapor. The conversion of vector beams from the probe beam to the conjugate beam is realized. In FWM experiments, the pump and the probe beam have orthogonal polarizations because of the polarization sensitivity of the FWM process and detection convenience. In order to satisfy the polarization sensitive phase matching condition and realize the nonlinear frequency conversion of vector beams, a Sagnac interferometer is used to form two FWM processes in the same rubidium cell, and two generated conjugate beams are combined with a polarizing beam splitter to form a conjugate vector beam. The experimental results agree well with our theoretical simulation. Compared with nonlinear optical crystals, the atomic vapor provides another platform to control and manipulate the vector beams nonlinearly.

Applied Physics LettersNov 18, 201917 citations

Spatio-temporal instability for counterpropagating beams in rubidium vapor

Agnès Maître, A. Petrossian, A. Blouin +2 more

Optics CommunicationsApr 1, 199521 citations

Resonant upconversion of ?=1.06 ?m radiation in rubidium vapors

V. A. Kiyashko, A. K. Popov, V. P. Timofeev +1 more

Applied Physics BMar 1, 19833 citations

High helicity vortex conversion in a rubidium vapor

Aurélien Chopinaud, Marion Jacquey, B. Viaris de Lesegno +1 more

The orbital angular momentum (OAM) of light is a quantity explored for communication and quantum technology, its key strength being a wide set of values offering a large basis for quantum working. In this context we have studied the vortex conversion from a red optical vortex to a blue one, for OAMs ranging $\ensuremath{-}30$ to $+30$ . The conversion is realized in a rubidium vapor, via the $5{S}_{1/2}\ensuremath{-}5{D}_{5/2}\phantom{\rule{0.16em}{0ex}}^{85}\mathrm{Rb}$ two-photon transition done with a Gaussian beam at $780\phantom{\rule{4pt}{0ex}}\mathrm{nm}$ plus a Laguerre-Gaussian beam at $776\phantom{\rule{4pt}{0ex}}\mathrm{nm}$ with the OAM $\ensuremath{\ell}$, producing a radiation at $420\phantom{\rule{4pt}{0ex}}\mathrm{nm}$ . With copropagating input beams, we demonstrate a conversion from red to blue for high-$\ensuremath{\ell}$ input vortices. We show that the output blue vortex respects the azimuthal phase matching, has a size determined by the product of the input beams, and a power decreasing with $\ensuremath{\ell}$, in agreement with their overlap. Its propagation indicates that the generated blue wave is a nearly pure Laguerre-Gaussian mode. The vortex converter thus permits a correct OAM transmission.The orbital angular momentum (OAM) of light is a quantity explored for communication and quantum technology, its key strength being a wide set of values offering a large basis for quantum working. In this context we have studied the vortex conversion from a red optical vortex to a blue one, for OAMs ranging $\ensuremath{-}30$ to $+30$. The conversion is realized in a rubidium vapor, via the $5{S}_{1/2}\ensuremath{-}5{D}_{5/2}\phantom{\rule{0.16em}{0ex}}^{85}\mathrm{Rb}$ two-photon transition done with a Gaussian beam at $780\phantom{\rule{4pt}{0ex}}\mathrm{nm}$ plus a Laguerre-Gaussian beam at $776\phantom{\rule{4pt}{0ex}}\mathrm{nm}$ with the OAM $\ensuremath{\ell}$, producing a radiation at $420\phantom{\rule{4pt}{0ex}}\mathrm{nm}$. With copropagating input beams, we demonstrate a conversion from red to blue for high-$\ensuremath{\ell}$ input vortices. We show that the output blue vortex respects the azimuthal phase matching, has a size determined by the product of the input beams, and a power decreasing with $\ensuremath{\ell}$, in agreement with their overlap. Its propagation indicates that the generated blue wave is a nearly pure Laguerre-Gaussian mode. The vortex converter thus permits a correct OAM transmission.

arXiv:1803.07182Physical Review AJun 6, 201849 citations

Towards Cooperative Resonance Effects in Rubidium Vapor

Matthew A. Morrison, Zhenhuan Yi, Chris O’Brien +4 more

Bulletin of the American Physical SocietyOct 19, 20140 citations

+30

. The conversion is realized in a rubidium vapor, via the $5{S}_{1/2}\ensuremath{-}5{D}_{5/2}\phantom{\rule{0.16em}{0ex}}^{85}\mathrm{Rb}$ two-photon transition done with a Gaussian beam at

780\phantom{\rule{4pt}{0ex}}\mathrm{nm}

plus a Laguerre-Gaussian beam at

776\phantom{\rule{4pt}{0ex}}\mathrm{nm}

with the OAM $\ensuremath{\ell}$, producing a radiation at

420\phantom{\rule{4pt}{0ex}}\mathrm{nm}

. With copropagating input beams, we demonstrate a conversion from red to blue for high-$\ensuremath{\ell}$ input vortices. We show that the output blue vortex respects the azimuthal phase matching, has a size determined by the product of the input beams, and a power decreasing with $\ensuremath{\ell}$, in agreement with their overlap. Its propagation indicates that the generated blue wave is a nearly pure Laguerre-Gaussian mode. The vortex converter thus permits a correct OAM transmission.