Transportable cryostat for optical frequency references

本课题组在低温宏观频率参考领域做了开创性的工作。这包括嵌在晶体中的原子集合以及光学谐振器。近年来，之前的工作得到了几个第三方项目的资助。我们想进一步发展这些研究项目。具体而言，我们有以下目标：-进一步开发由硅和其他材料制成的超稳定低温光学谐振器，用于激光器的频率稳定。-基于掺铕晶体的频率参考的发展。-在我们的高精度光学中性原子钟上使用低温谐振器稳定的时钟激光。这是可移动的。之后，我们将在两个外部地点与合作伙伴合作建立并进行测量。本文所采用的低温恒温器及其内置的谐振腔可以提高光学原子钟的性能。第一次合作是关于一项新技术的进一步发展，相对论（基于时钟的）大地测量学。第二次合作涉及为欧空局的“ACES”任务做出贡献，该任务将于2020年按计划发射到国际空间站（ISS），并在那里运行数年。我们在韦特泽尔基础站运行的原子钟将能够测量引力场中的时间膨胀，并测试新的基于卫星的时间和频率测量技术。-研究以比以前更高的精度测试洛伦兹不变性的可行性，并执行相同的操作。这种测试在过去已经用低温谐振器和室温谐振器进行过。应用的低温恒温器打开了推进到一个新的精度水平的潜力。-基于频率参考或荧光中心的暗物质探测器的可行性研究。“物质填充”谐振器的概念也将被测试。-改进了空间量子力学涨落存在性的测试。

Our group has done pioneering work in the field of cryogenic macroscopic frequency references. This includes ensembles of atoms embedded in a crystal as well as optical resonators. The previous work has been funded by several third-party projects in recent years. We want to further develop these research lines. Specifically, we have the following goals:- Further development of ultra-stable cryogenic optical resonators made of silicon and other materials for frequency stabilization of lasers.- Development of frequency references based on europium-doped crystals.- Use of the clock laser stabilized on a cryogenic resonator at our high-precision optical neutral atom clock. This is transportable. Afterwards, we will set it up in cooperation with partners at two external locations and carry out measurements. The cryostat applied for here with the contained resonator serves to improve the performance of the optical atomic clock. The first cooperation is about the further development of a new technology, relativistic (clock-based) geodesy. The second cooperation involves a contribution to ESA's "ACES" mission, which will be launched on schedule in 2020 to the International Space Station (ISS) and operated there for several years. Our atomic clock, operated at the Wettzell Fundamental Station, will enable the measurement of time dilation in the gravitational field and the testing of new satellite-based time and frequency measurement techniques.- Investigating the feasibility of testing the Lorentz invariance with higher accuracy than before, and performing the same. Such tests have been performed in the past with cryogenic resonators as well as with room temperature resonators. The cryostat applied for opens up the potential of advancing to a new level of precision. - Feasibility study of detectors for dark matter based on frequency references or fluorescence centers. Concepts for "matter-filled" resonators will also be tested. - Improved tests for the existence of quantum mechanical fluctuations of space Translated with www.DeepL.com/Translator.