霍曼转移结构光束设计及微粒操纵（特邀）

结合光束塑形技术、坐标变换技术、傅里叶相移定理,成功产生了霍曼转移结构光束,其具备相位梯度,从而拥有在微观世界中输运粒子的能力,并且大小、结构、相位梯度,均可任意调控,在应用中可依据实际需求对光束进行相应的调整。搭建光镊实验光路,并使用霍曼转移结构光束对聚苯乙烯粒子进行了操控,其实验结果与理论相符,可以使粒子完美的沿着轨道进行输运。该研究在光学微操纵特别是粒子的变轨运输领域具有重要的意义。     

Observation of multi-Raman gain resonances in rubidium vapor

We present an experimental study of multi-Raman gain resonances in a hot rubidium vapor.The experiment is performed based on a high-efficiency four-wave mixing process due to the Raman-driven coherence in a double-A configuration.The Raman gain resonance for ~(85)Rb atoms under a bias magnetic field is shown to be split into five or six peaks,depending on the orientation of the magnetic field.The formed multi-Raman gain resonances have potential applications in measurement of magnetic fields and generation of multi-frequency correlated twin beams.