Title: Detuning Tunable OAM Generation via Double-$Λ$ Four-Wave Mixing in Hot Rubidium Vapor Show Chinese title

Title: 通过热铷蒸气中的双$Λ$四波混频进行失谐可调OAM生成

Abstract: We demonstrate detuning-tunable generation of orbital-angular-momentum (OAM) light using a double Lambda four-wave-mixing (FWM) process in Doppler broadened rubidium vapor. Two near-resonant pumps on the D1 line drive non degenerate FWM that produces bright probe conjugate beams whose transverse modes evolve with pump detuning. A paraxial density-matrix model coupled to split-step propagation predicts detuning-dependent spatial gain shaping that sets the OAM content; experiments with a mode cleaned pump laser and a 12-mm AR-coated vapor cell validate these predictions. We quantify mode formation by imaging, spectroscopy, and power measurements, and verify OAM conservation between the generated beams. The results establish resonant atomic vapor as a compact, tunable platform for structured-light generation with applications to high-dimensional quantum communications and imaging. Show Chinese abstract

Abstract: 我们展示了在多普勒展宽的铷蒸气中使用双Lambda四波混频（FWM）过程实现可调谐失谐的轨道角动量（OAM）光生成。 D1线上的两个近共振泵浦光驱动非简并FWM，产生明亮的探测束共轭光束，其横向模式随着泵浦失谐而演化。 一个与分步传播耦合的傍轴密度矩阵模型预测了与失谐相关的空间增益整形，这决定了OAM内容；使用模式清洁的泵浦激光和12毫米抗反射涂层的蒸气细胞进行的实验验证了这些预测。 我们通过成像、光谱分析和功率测量来量化模式形成，并验证生成光束之间的OAM守恒。 结果确立了共振原子蒸气作为结构光生成的紧凑、可调平台，可用于高维量子通信和成像应用。