The transfer of optical vortices is studied based on double two-photon processes in a four-level diamond configuration system. A pair of strong fields are applied to prepare atomic coherence, while two weak probe fields are coupled with the other two transitions. When the two-photon resonances are satisfied, the analytical results for the intensities of the probe fields are calculated using perturbation theory and an adiabatic approximation approach. Our results explore whether the orbital angular momentum of an input probe beam or the second control field can be transferred to the generated probe field, and this is verified by numerical simulation. It is interesting that as the intensities of the control fields increase, the propagation of probe beams exhibits oscillation behaviors only when the one-photon detuning is nonzero. Furthermore, we show that the absorption losses are minimized, and the transfer efficiency is enhanced by appropriately modifying the one-photon detuning together with the control-field Rabi frequencies.

中文翻译：

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在金刚石构型原子系统中使用双光子过程传递光学涡旋

在四级金刚石配置系统中，基于双双光子过程研究了光学涡旋的传递。一对强场用于准备原子相干，而两个弱探测场与其他两个跃迁耦合。当满足两个光子共振时，使用微扰理论和绝热近似方法计算探测场强度的分析结果。我们的结果探讨了输入探测光束或第二控制场的轨道角动量是否可以转移到生成的探测场，并通过数值模拟对此进行了验证。有趣的是，随着控制场强度的增加，仅当单光子失谐不为零时，探测光束的传播才会表现出振荡行为。此外，