Modulated vortex six-wave mixing

Abstract

We have experimentally generated a vortex six-wave mixing (SWM) signal via a photonic band gap structure in a hot atomic ensemble. The output SWM carrying orbital angular momentum, transferred from a probe beam, has the interaction with the nonlinear effect in the multilevel atomic system. Our results show that a spatial SWM image can be modulated by the detunings and intensities of the related generating fields. Also, the nonreciprocal feature of the SWM signal is demonstrated. Such characteristics can potentially be used in information processing.

Vector Optical Beam with Controllable Variation of Polarization during Propagation in Free Space: A Review

“…However, effective methods to achieve the longitudinal manipulation of polarization in free space provide the technical basis for constructing diverse and desired longitudinal distributions of polarization, which may induce special responses in various mediums. The propagation-dependent polarized feature may extend the form of spin-orbit coupling in bulk material or cavities [71] as well as bringing novel physical effects related to the z-dependent nonlinear [72,73] and topological effects [74]. Combining consideration of the application prospects of the vector optical beam with the longitudinal distribution of polarization in volume laser machining [49], longitudinal detection [30], and in vivo manipulation of multiple polarizing elements [52,75], we believe that increased attention paid to the characteristics of this beam when it interacts with matter will facilitate progress in the application of structured light.…”

Propagation properties of chirped Airy vortex beams with x -polarization through uniaxial crystals

“…From these figures, we can see that the intensity first distributes in the side lobes because of the vortex and, as the CAiV beams propagate, the intensity distributions in the main lobes are strengthened and those in the side lobes are weakened, the reason for this is that the acceleration of the vortex is much higher than that of the main lobe. Meanwhile, compared with the traditional vortex modulated by the dressing nonlinear phase in an atomic ensemble whose characteristics can be controlled by the laser intensities, nonlinear dispersion, atomic density, detunings and intensities of the related generating fields, [21,22] the chirp parameters will affect the velocity of the vortex in the uniaxial crystals. When the chirp factor increases, the velocity of the vortex decreases.…”

Quantum electrodynamics in modern optics and photonics: tutorial

“…QED theory has also predicted the existence of a six-wave mixing process with optical vortices [190]. Both of these six-wave mixing phenomena have been vindicated by subsequent experimental evidence [191,192]. Short-range cooperative effects between molecules were also discovered using QED, whereby a mutual pairwise interaction between molecules leads to cooperative two-photon absorption (also termed mean-frequency absorption) [193][194][195].…”