Transportable cryostat for optical frequency references

本课题组在低温宏观频率基准领域做出了开创性的工作。这包括嵌入晶体中的原子系综以及光学谐振器。近年来，该项目得到了多个第三方项目的资助。我们希望进一步发展这些研究领域。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基准的开发。在我们的高精度光学中性原子钟中使用低温谐振腔稳定的时钟激光器。这是可移动的。之后，我们将与合作伙伴在两个外部地点合作设置并进行测量。低温恒温器与所包含的谐振器一起用于改善光学原子钟的性能。第一项合作是关于进一步发展一项新技术，即相对论（基于时钟的）大地测量学。第二项合作涉及对欧空局“ACES”使命的贡献，该使命将于2020年如期发射到国际空间站（ISS）并在那里运行数年。我们的原子钟在Wettzell基本站运行，将能够测量重力场的时间膨胀，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。过去已经用低温谐振器以及用室温谐振器进行了这样的测试。应用的低温恒温器开辟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”谐振器的概念也将受到测试。- 空间量子力学波动存在的改进测试与www.DeepL.com/Translator翻译。

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.