Ultrasensitive Measurements of Forces Using Laser-Cooled Atoms

使用激光冷却原子对力进行超灵敏测量

• 批准号: 227627-2013
• 负责人: Kumarakrishnan, Anantharaman
• 金额: $ 1.97万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=524042
• 关键词: Ultrasensitive; Measurements; Forces; Using; Laser

Precise knowledge of the basic forces that govern and shape our universe is of paramount importance not only for fundamental science, but also for technological breakthroughs. This proposal seeks operational funding for a broad research program utilizing cold atoms for the precision measurements of a variety of basic forces. The main scientific goals of the proposal are: precision measurement of the gravitational acceleration g, precision measurement of the strength of the electromagnetic force (the fine-structure constant) and the precision measurement of the magnetic properties of atoms (g-factor ratios). These experiments have recently achieved benchmarks that suggest that high impact precision studies are realizable in the near future. In particular, a unique, cold atom interferometer (AI) will be developed for measurements of g. This will enable the current measurement precision of 125 parts per billion (ppb) to reach internationally competitive levels of 1 ppb. This initiative is supported by an industrial partner who is the leading manufacturer of commercial gravimeters, devices that measure g for widespread applications such as oil and mineral prospecting, seismic monitoring and correction of tidal charts. The same AI recently demonstrated measurement time scales comparable to the widely known Raman AIs and realized a precision of 37 ppb in measurements of the atomic recoil frequency, a quantity that is related to the atomic fine-structure constant, a coupling parameter that defines the strength of light-matter interactions. We propose to reduce systematic effects and realize a precision of ~1 ppb. The applicant's group has recently made the most sensitive measurement of a particular class of magnetic interactions. Using a refined experiment we propose to further improve the precision and avoid systematic effects. The main commercial and technological outcomes include: 1) Realization of a new generation of gravimeters based on auto-locked lasers developed by the applicant and new techniques for calibrating commercial gravimeters 2) Development of Canada's first rubidium-based atomic clock 3) Development of auto-locked lasers as LIDAR transmitters for pollution monitoring and exploration of planetary atmospheres.

对管理和塑造我们宇宙的基本力量的精确知识不仅对基本科学，而且对技术突破至关重要。该提案寻求利用冷原子的广泛研究计划进行运营资金，以精确测量各种基本力量。该提案的主要科学目标是：重力加速G的精确测量，电磁力强度的精度测量（细结构常数）和原子磁性特性的精确测量（G-FACTOR比率）。这些实验最近实现了基准，表明在不久的将来可以实现高影响精度研究。 特别是，将开发一个独特的冷原子干涉仪（AI），以测量G。这将使目前的测量精度为十亿（PPB）125个零件，以达到1 ppb的国际竞争水平。该倡议得到了工业合作伙伴的支持，该工业合作伙伴是商业仓库的领先制造商，该倡议是为诸如石油和矿物质勘探，地震监测和潮汐图校正等广泛应用的设备测量G的设备。最近的AI最近证明了与广为人知的拉曼AIS相当的测量时间尺度，并在原子后坐力频率的测量中实现了37 ppb的精度，该数量与原子细胞结构常数相关，该数量与原子良好的结构常数相关，这是一种耦合参数，该参数定义了光 - 含量相互作用的强度。我们建议降低系统效应并实现约1 ppb的精度。申请人组最近对特定类别的磁相互作用进行了最敏感的测量。使用精致的实验，我们建议进一步提高精度并避免系统效应。主要的商业和技术成果包括：1）基于申请人开发的自动锁定激光器的新一代重量表和校准商业重量表的新技术2）加拿大基于bubidium的原子时钟的开发3）开发自动锁定激光器的开发，以污染PlaneTrution Monurant和PlaneToration splaneToration和PlaneToration sallorate saltorate y restory intersarty intersarty intersarty intersory intersory intersory silteratory intersory silteres intersory silteres interes inters of的氛围。