Interaction of transverse modes via four-wave mixing in a rubidium vapor cell inside a ring resonator: A nonlinear optical analogy to Bose-Einstein condensation

通过环形谐振器内铷蒸汽室中的四波混频实现横向模式的相互作用：玻色-爱因斯坦凝聚的非线性光学类比

• 批准号: 0101501
• 负责人: Raymond Chiao
• 金额: $ 36万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0101501&HistoricalAwards=false
• 关键词: Interaction; transverse; modes; via; four

This project focuses on the study of the transverse dynamics of a nearly-confocal nonlinear Fabry-Perot ring resonator, using a rubidium vapor cell placed in the resonator as a Kerr medium. Coupling by four-wave mixing of the transverse modes is predicted to produce a transverse cavity mode spectrum consisting of a central spike corresponding to the lowest on-axis TEM-00 mode, on top of a low pedestal of higher modes. The similarity of this transverse mode spectrum to the central spike formed by bosons in the momentum space distribution when they undergo Bose-Einstein condensation (BEC) suggests that these phenomena can also be understood by an analogy to BEC. Extending this analogy, the group will attempt to observe a BEC-like phase transition in which the well-collimated output beam corresponding to the central-spike momentum spectrum suddenly becomes uncollimated as a random modulation of the input laser light by crossed AOMs is increased beyond a certain critical amplitude.

本计画主要研究近共焦非线性法布里-珀罗环形谐振腔的横向动力学，并将铷蒸气池置于谐振腔中作为克尔介质。 通过横向模式的四波混频耦合预测产生横向腔模式谱，该横向腔模式谱由对应于最低轴上TEM-00模式的中心尖峰组成，在较高模式的低基座的顶部上。 这种横模谱与玻色子在进行玻色-爱因斯坦凝聚（BEC）时在动量空间分布中形成的中心尖峰的相似性表明，这些现象也可以通过与BEC的类比来理解。 扩展这个类比，该小组将试图观察类似BEC的相变，其中对应于中心尖峰动量谱的准直输出光束突然变得不准直，因为交叉AOM对输入激光的随机调制增加到超过一定的临界幅度。