Optical noise sources of low Earth orbiter links (A05)

在A05项目中，我们研究了下一代重力任务（NGGM）的局部噪声源。在第一个资助期，我们专注于角抖动与激光干涉仪读数的交叉耦合，研究耦合机制和缓解策略。在第二个资助期，我们将专注于NGGM干涉测量的详细研究，比较几种可能的光学布局，然后在项目B06中构建一个。除了传统的制造和尺寸限制外，这种比较中的优点数字将取决于TTL缓解，但也取决于杂散光耦合。因此，第二个重点将放在描述剪切相干杂散光束及其传播的方法的发展和验证上。最后，所有模拟的准确性目前都受到实验对应物中存在的激光束波前特性的详细知识的限制。因此，我们将开发，测试和验证方法，以提高激光束的测量精度。

In project A05, we investigate local noise sources for Next Generation Gravity Missions (NGGM). In the first funding period, we focused on the cross coupling of angular jitter to the laser interferometer readout, investigating coupling mechanisms and mitigation strategies. In the second funding period, we will focus on detailed investigations of the interferometry in an NGGM, comparing several possible optical layouts from which one will then be built in project B06. Besides classical manufacturing and dimensional constraints, the figure of merit in this comparison will for instance depend on TTL mitigation, but also on stray light coupling. Therefore, a second focus will be on the development and validation of methods for the description of clipped coherent stray beams and their propagation. Finally, the accuracy of all simulations is currently limited by the detailed knowledge of laser beam wavefront properties present in the experimental counterpart. Thus, we will develop, test and validate methods to improve the measurement accuracy of laser beams.